Database Users

Bootloop on brand new 4.2.2

I've encountered an unpleasantly unique problem (as far as the internet is concerned) with my Nexus 7.
It started when I wanted to upgrade my Nexus from 4.2.1 to 4.2.2. For whatever reason, the upgrade wouldn't install, gave me an error a quarter of the way through and booted me back into 4.2.1 with no repercussions.
Using WugFresh's Nexus Root Toolkit, I managed to get 4.2.2 onto there by flashing it over everything. It seemed fine, but went into a bootloop on the Google splash screen before it could start up and go through the first time setup.
I have tried everything. I tried flashing again with NRT, and got the image attatched, a hither-to unseen error that could not be fixed with a pc reboot or reinstall of NRT. I tried using the old Nexus Toolkit to boot into CWM recovery, but since USB debugging isn't (and can't be) turned on, that could do nothing. I've tried using the SDK command line to unlock it and flash it, but the device can't be found because it hasn't been booted up for that first time startup configuration. I've tried uninstalling all the drivers and trying all of that again, with nothing.
What's left is a nexus 7 with a brand new 4.2.2 that can't boot, no USB debugging, that is locked and unrooted. I can get into the bootloader, but there's no recovery installed.
I'm sorry if this has happened before. I'm sorry if this isn't new. But good christ almighty I just want my tablet to work.
tl:dr help me gods of the Android

If you can boot into the bootloader, can you use the SDK's fastboot tool to flash the stock recovery?

jfmcbrayer said:
If you can boot into the bootloader, can you use the SDK's fastboot tool to flash the stock recovery?
Click to expand...
Click to collapse
Nope. It just says "<waiting for device>" and stalls indefinitely when trying to flash anything onto the device.

fudgyhoops said:
Nope. It just says "<waiting for device>" and stalls indefinitely when trying to flash anything onto the device.
Click to expand...
Click to collapse
I suppose "fastboot oem unlock" doesn't work, either?

fudgyhoops said:
Nope. It just says "<waiting for device>" and stalls indefinitely when trying to flash anything onto the device.
Click to expand...
Click to collapse
As long as you can get into fastboot, you should be able to use fastboot commands, sounds like you have a driver problem. Did you uninstall all the drivers and install the pdanet drivers? If the pdanet drivers don't work try naked drivers. It doesn't matter if debugging is enabled or not or if your device is unlocked and unrooted, you should still be able to do everything via fastboot commands. I recommend wiping everything via fastboot commands and than flashing the stock image. I recommend avoiding rootkits they are more trouble than they're worth, fast boot is a lot easier, faster and safer. You might want to try a different computer if nothing else works. You might have a defective bootloader though. Make sure you check the device manager on your computer to see if there are any errors with the drivers, it should show a yellow triangle if the driver is not working, if that's the case click on update driver and navigate to the SDK drivers.
http://www.androidegis.com/how-to/how-to-unbrick-the-nexus-7/
---------- Post added at 09:01 AM ---------- Previous post was at 08:54 AM ----------
Once you get the stock image flashed, unlocked and rooted, you can use goo manager to install the twrp recovery.

jfmcbrayer said:
I suppose "fastboot oem unlock" doesn't work, either?
Click to expand...
Click to collapse
I was surprised when it did. I had done a full driver reinstall to prestige777's advice, and fastboot started working again. Ran into an error when trying to flash 4.2.2 and bootloader version 4.18 with mismatched signatures, but tried it on another computer (thank you prestige777 again) and it's booting!
Thank you both so much!

fudgyhoops said:
I was surprised when it did. I had done a full driver reinstall to prestige777's advice, and fastboot started working again. Ran into an error when trying to flash 4.2.2 and bootloader version 4.18 with mismatched signatures, but tried it on another computer (thank you prestige777 again) and it's booting!
Thank you both so much!
Click to expand...
Click to collapse
No problem, I'm glad it worked for you.

Nexus 7 2012 (GSM) Booting Failed/No OS

i have access to ADB and fastboot mode.
i also try google factory image(see the attach picture for the result)

niceguy01 said:
i have access to ADB and fastboot mode.
i also try google factory image(see the attach picture for the result)
Click to expand...
Click to collapse
Yes, me too. I can't load anything except ADB & Fastboot. I used the Nexus 7 Toolkit to try to update to Kit Kat and now I have a soft bricked device. HELP!!!:crying:

Have you tried using adb shell command prompt to push the files to your device instead of a root toolkit?

cr0wnest said:
Have you tried using adb shell command prompt to push the files to your device instead of a root toolkit?
Click to expand...
Click to collapse
what file do i need to push in my device??

Effing toolkits again. When will they be banned for once and for all?
Oh that's right. They bring in ad revenue from lazy people.
Sent from my Nexus 5

niceguy01 said:
what file do i need to push in my device??
Click to expand...
Click to collapse
Check out this sticky here, it gives instructions on how to do it and what files are required. Its quite a lengthy guide, but its the safest method. http://forum.xda-developers.com/showthread.php?t=1907796

Pirateghost said:
Effing toolkits again. When will they be banned for once and for all?
Oh that's right. They bring in ad revenue from lazy people.
Sent from my Nexus 5
Click to expand...
Click to collapse
sorry im just a newbie:angel:

UPDATE: booting failed already gone by flashing cyanogen rom
the problem now is stuck in booting.see the attach picture
what is the meaning of
archive does not contain boot.sig
archive does not contain recovery.sig
archive does not contain system.sig

Got the same problem...I used RTK to flash 4.4 and ended up with a soft bricked N7.
Well initially I haven't been able to update any newer versions of CM. I was stuck on 10.2 nightly. I got a notification that there's an update so I downloaded it and tried installing. I get stuck when my N7 will go into recovery, I'll always get the droid with the red exclamation point and I have to stop the update. But I will always be able to do a system reboot and use the N7. After flashing using the RTK, all I can do is boot into the Bootloader mode. Choice at that point it Recovery, Reboot Recovert, Reboot Bootloader and Power Off. If I choose Recovery nothing happens. So the real choice is only to power off or reboot the bootloader.
I tried using fast boot but the guide I got was asking me to put the tablet in debugging mode (which I can't really do). And I get an error when doing the steps in CMD. I think I wasn't able to properly load the drivers because I am not seeing my device listed with serial number when I run >dab devices.
Kindda stuck and waiting where this thread will lead to as well so I can fix my N7.
Also, when I get the factory image (JWR66V) and run 7-zip on it, I don't see these files: bootloader-grouper-4.23.img, image-nakasi-jwr66y.zip, flash-all.sh, flash-base.sh. I only see 1 file.

As mentioned in about 5 billion threads, USB debugging has nothing to do outside of a booted OS.
Fix your drivers.
Unzip the factory image archive.
Sent from my Nexus 5

^Fixed my drivers (via SDK). PC recognised the device via fast boot devices. Ran a set of commands fast boot erase boot, cache, recovery, system, and user data. Flashed boot loader and reboot boot loader. Flashed 4.3 factory image (extracted via 7zip). Flashing/Update FAILED (I think the error was 'too mani links') and it went back to a blinking cursor.
@niceguy01 - just wait for CMD to process the entire thing. I was worried as well when I saw the system does not contain boot.sig etc error. Waited for it and started getting some scripts after. Wasn't able to complete the flash though but little steps getting there.

where should i flash radio.img?
boot,bootloader,recovery.system or userdata??see the picture
thanks

None of the above
Sent from my Nexus 5

Pirateghost said:
None of the above
Sent from my Nexus 5
Click to expand...
Click to collapse
thanks:good:

finally i got manage to fix my N7,thanks anyone who help me:good:
-----------thread close------------
i use google nexus toolkit v4 and install sdk drivers

[Q] installation of CM11 went sour, now in boot loop - any ideas?

I tried installing CM with CM Installer for MAC ... until it got stuck in bootloop.
Using adb I pushed image, still bootloop.
Reset to factory, cleared partition, flushed dalvik cache, all the same.
adb commands seem to work since I can make the phone reset and so forth.
details:
mako 16 GB
HW version - rev_11
bootloader version MAKOZ30d
baseband M9615A-CEFWMAZM02.0.1701.02
signing - production
secure boot - enabled
lock state - unlocked
recovery mode is CWM v6.0.4.7 (assuming it got installed by the CM installer for MAC)
tried by hand to resuscitate with cm-11-20141008-SNAPSHOT-M11-mako.zip and cm-11-20141107-NIGHTLY-mako.zip using sideload to no avail - still bootloops despite numerous factory resets and cache partition wipes.
any ideas please?
thanks

This is what i use: http://forum.xda-developers.com/nex...olkit-wugs-nexus-root-toolkit-v1-8-2-t2015469
Has multiple options for going back to stock, rooting, and lots of other things.

TreatnHerRight said:
This is what i use: http://forum.xda-developers.com/nex...olkit-wugs-nexus-root-toolkit-v1-8-2-t2015469
Has multiple options for going back to stock, rooting, and lots of other things.
Click to expand...
Click to collapse
That looks great ... and uses Windows only
I can boot Windows under VMWare Fusion on my MAC however not 100% sure if that would work within that environment as I need to do some USB passthrough.
Thanks for the pointer though.

ilmoomino said:
I tried installing CM with CM Installer for MAC ... until it got stuck in bootloop.
Using adb I pushed image, still bootloop.
Reset to factory, cleared partition, flushed dalvik cache, all the same.
adb commands seem to work since I can make the phone reset and so forth.
details:
mako 16 GB
HW version - rev_11
bootloader version MAKOZ30d
baseband M9615A-CEFWMAZM02.0.1701.02
signing - production
secure boot - enabled
lock state - unlocked
recovery mode is CWM v6.0.4.7 (assuming it got installed by the CM installer for MAC)
tried by hand to resuscitate with cm-11-20141008-SNAPSHOT-M11-mako.zip and cm-11-20141107-NIGHTLY-mako.zip using sideload to no avail - still bootloops despite numerous factory resets and cache partition wipes.
any ideas please?
thanks
Click to expand...
Click to collapse
Honestly, when I get into these situations I just flash the stock images and use that as a starting point. (I'm guessing your recovery is still working fine, given what you've said, so you can pull that out of the zip it sends so it doesn't write over it)
My approach, however, is usually, "damn, I messed up, let's go back to a known good point and try again" though, so keep that in mind if you decide to follow this path.

nic0lette said:
Honestly, when I get into these situations I just flash the stock images and use that as a starting point. (I'm guessing your recovery is still working fine, given what you've said, so you can pull that out of the zip it sends so it doesn't write over it)
My approach, however, is usually, "damn, I messed up, let's go back to a known good point and try again" though, so keep that in mind if you decide to follow this path.
Click to expand...
Click to collapse
That didn't work either (the restore to stock).
The USB passthrough on VMWare fusion works like a charm, ADB sees the device, passing commands on from the Windows application, rebooting and so forth.
However once it goes through the repair process at some point I get some strange cyan screen with white and lilac blinking lines and the program keeps saying "waiting for your device (or phone, or whatever" ...
Losing the will to live.

ilmoomino said:
That didn't work either (the restore to stock).
The USB passthrough on VMWare fusion works like a charm, ADB sees the device, passing commands on from the Windows application, rebooting and so forth.
However once it goes through the repair process at some point I get some strange cyan screen with white and lilac blinking lines and the program keeps saying "waiting for your device (or phone, or whatever" ...
Losing the will to live.
Click to expand...
Click to collapse
Why are you using VMWare? You should be able to download the tools you need for WIndows, Mac, or Linux.
Go and grab the Android SDK and install the "Android SDK Platoform-tools" and download 4.4.4 image from Google.
Once you have those two things, unzip the factory image and do "adb reboot bootloader" and then run "sh flash-all.sh" from a command prompt. This will use fastboot to write an img file to the partitions on the device, so if you can't run the SDK tools, for whatever reason, use fastboot to run the commands in the file. (That is, don't use recovery and adb sideload, do it through fastboot)
The -w option will wipe your data, so if you want you can try and run the last line (fastboot -w update image-occam-ktu84p.zip) without the "-w", but if it doesn't work then I'd try it again with it.
If you can boot into the bootloader and recovery then your device isn't dead. Worst case you have to go to a friend's place and flash it there.

nic0lette said:
Why are you using VMWare? You should be able to download the tools you need for WIndows, Mac, or Linux.
Go and grab the Android SDK and install the "Android SDK Platoform-tools" and download 4.4.4 image from Google.
Once you have those two things, unzip the factory image and do "adb reboot bootloader" and then run "sh flash-all.sh" from a command prompt. This will use fastboot to write an img file to the partitions on the device, so if you can't run the SDK tools, for whatever reason, use fastboot to run the commands in the file. (That is, don't use recovery and adb sideload, do it through fastboot)
The -w option will wipe your data, so if you want you can try and run the last line (fastboot -w update image-occam-ktu84p.zip) without the "-w", but if it doesn't work then I'd try it again with it.
If you can boot into the bootloader and recovery then your device isn't dead. Worst case you have to go to a friend's place and flash it there.
Click to expand...
Click to collapse
I am using VMWare Fusion since my Windows work laptop is dead (courtesy of lost charger).
So I must use my Mac (which used the CM installer where things went sour).
Doubt it is a problem since I can get ADB to work.
I have already dowloaded the Android SDK Platoform-tools and stock 4.4.4.
I used ADB on MAC, but after I copy the ROM the phone does some scroll-bar progress, then I clear partitions/factory erase/cache ... and boot loop again.
I will follow your advice and use the described process.
You are right - as long as I have bootloader I am safe.
Might go and buy Moto X+1 or Sony X3 ... as I want to go 4G but thought might use the N4 for another few months.
thanks

following instructions from nic0lette I have now my phone back to normal ...
will try CM using the same instructions ... well, using the flash-all.sh as a base script
thanks (and "thanked")

[Beginners Guide] Unlock & Custom ROM your TF300

I have been asked to port my "Beginners Guide" from the TF700 forum for the TF300. Since both tablets are very similar, that was not too hard to do
If I have missed to update a link specific for the TF300, do let me know please.
And the standard disclaimer: I am not responsible if you misunderstand instructions I give here, if my instructions are wrong, if you forget to charge the battery and the tablet dies halfway through a flash or if your house goes up in flames. YOU DO THIS AT YOUR OWN RISK
These instructions assume that you are on the latest Asus bootloader: 10.6.1.27.5
To determine which bootloader you currently have:
From an "Off" state, boot the tablet with Volume Down and Power into the bootloader menu. Read the small script in the upper left. You'll see
US_epad-10.6.1.27.5-20130801" or similar.
US or WW, JP, CN is your SKU or region
10.6.1.27.5 is your bootloader version
20130801 is the build date (and immaterial in most cases).
First things first:
Backup everything on your tablet you care about to an external microSD or your PC. Don't worry about your apps. You can always install them from the Play Store.
This is just common sense. It is not inherently risky to flash custom ROMs. But something can wrong at any time and you have to be careful. If you are, this is a safe procedure.
Basically the process of flashing a custom ROM on the TF300 involves three steps:
1) Unlock the bootloader using Asus' Unlock tool
2) Install a custom recovery on the tablet
3) Flash a custom ROM of your choice using said custom recovery​
Unlocking the bootloader
Your tablet should be fully charged at this point!
Make sure "USB debugging" is checked in Settings > Developer Options (if you don't see it, go to About Tablet and tap 7 times on Build Number)
Go to Asus website: https://www.asus.com/support/Download/28/1/0/9/8BmzkQ4yoz5WzBrW/32/
Choose "Android" for OS and look for the "Utilities" on the resulting page.
Download the Asus Unlock Tool v7 (not v8! It says v7 is for ICS but it'll work fine on JB - see below)
The tool downloads as a .rar file which is an archive you have to decompress. 7zip is a free and very good Windows tool that will do it for you
On your tablet, in Settings > Security check "Unknown Sources"
Copy the .apk you extracted from the .rar archive to your tablet.
Find the apk in your tablet's file browser, tap it and let it install
Open the app and follow the instructions. You will loose your warranty as soon as you click "I agree".
Update 2/15: Google added another wrinkle: It now checks even sideloaded apps and refuses to install them if they are considered not secure. The Unlock tool seems to fail their test. v8 does not install at all anymore. v7 will install if you allow "less secure apps" in your Google account settings. On the web - not your Google account on the tablet
July 2015: And another wrinkel... It seems to be pretty consistent now that the Unlock Tool hangs on the Google account password step. I suspect something changed on the Google side. It probably doesn't allow the tool to check/compare the password anymore. There have been quite a few security changes lately and the unlock tool never gets updated so I suspect that Google now is blocking access by the tool to it's servers.
The work-around is easy enough: Delete the Google account from the tablet (Settings > Accounts), then run the tool again. If that doesn't do it, do a factory reset from Settings, reboot and during the initial setup establish a WiFi connection but skip the google account setup, then run the tool
Click to expand...
Click to collapse
This can be a 5 Minute operation that goes without a hitch or a very frustrating experience with lots of error messages. There is no definite rhyme or reason for this. For some people it works like a charm, for others it works after 15, 25 or 55 attempts, for some never.... This problem is widely discussed on several forums. Google it if you hit that roadblock.
To check if you are unlocked, boot the tablet and read the tiny script. It should say:
The device is unlocked.
Installing a custom recovery on your tablet
I highly recommend you choose TWRP as your custom recovery. If you want CWM, you are on your own.
To push TWRP to your tablet you need to set up "Fastboot" between your tablet and your PC. Fastboot is a protocol that enables you low level access to your tablet.
Practice/Background
Power down your tablet and disconnect it from the dock
Push and hold the Volume Down key (left side of the rocker) and the Power key until you feel the tablet vibrate twice. Let go when you see the tiny script. Read it and it tells you that your tablet is now in fastboot mode and you will see three icons (I assume again you are on a JB 4.2 bootloader. In older bootloaders you had 4 icons and had to select the USB icon to get into fastboot mode):
RCK - (which should be flashing) is your recovery (the stock recovery at this point, but once TWRP is installed this is one way to get into it)
Android - is your system, selecting it boots you back to into your ROM.
Wipe Data - stay away! Especially with custom software installed never, ever use this option!
To toggle between the three icons use Volume Down, to select one use Volume Up. Try it but do not push Volume Up when the 'Wipe data' icon is flashing!​
Installing ADB and fastboot plus the necessary drivers
For a working ADB/fastboot connection from PC to tablet you need:
a) Asus device drivers – if you connect the tablet to your PC and it's recognized as a portable device you should be ok. If not, download the Asus Sync Utility from their support/downloads site and install it to get the drivers, then uninstall the program from your PC if you don't want it. The drivers will stay.
b) Fastboot and ADB drivers which will be installed if you run the tool below.
Windows Vista, 7, 8, 10:
Download and run this cool little tool [TOOL] [WINDOWS] ADB, Fastboot and Drivers - 15 seconds ADB Installer v1.1 - xda-developers (don't forget to hit the Thanks button)
The tool installs the adb and fastboot.exe to a folder on your C:\ drive (look for adb) and the corresponding drivers. Takes about 15 seconds.
On Windows 8 and 10 you need to turn off the driver verification feature. Here's a great video on how to do it:
https://www.youtube.com/watch?v=afrvSGiMAtk
Or - even better - here's a quick command line toggle to achieve the same (thank you @Jack_Hardin):
Jack_Hardin said:
If you're running W10, you can disable Device Driver Signing without following the procedure in the linked video, but by (more simply) right-clicking on the Start button, selecting Command Prompt (Admin) and then typing:
Code:
BCDEDIT /set nointegritychecks ON
Doing the same with OFF at the end of the string, as easy to guess as it looks, will reenable them.
Click to expand...
Click to collapse
Jack_Hardin said:
Win XP (and all other Win versions if the above does not work for some reason)
I recommend the "ADB Install Tool" mentioned above or the 'Minimal ADB Fastboot Tool': [TOOL]Minimal ADB and Fastboot [7-18-13] - xda-developers
Either works fine.
If you need the drivers, get them here and install manually in Device Manager:[ADB/FB/APX Driver] Universal Naked Driver 0.72 (We dont need no stinking HTC Sync) - xda-developers
Win7 and Win8 users seem to have the best luck wth the drivers sbdags provided here: http://forum.xda-developers.com/showthread.php?t=2646279
It's fine if you want to use his Recovery Install Tool from that thread. But I highly recommend you familiarize yourself with basic fastboot commands! There are lots of tuturials all over the web.
Linux:Check out this site https://code.google.com/p/adb-fastboot-install/
iOS:[GUIDE] Set up ADB and Fastboot on a Mac easily (With Screenshots!) - xda-developers or:
http://htc-one.wonderhowto.com/how-...-mac-os-x-send-commands-your-htc-one-0151178/
The fun begins
Fastboot does not play well with USB 3.0, so use a USB 2.0 port for this. And no hubs and such....
Boot the tablet into fastboot mode and connect it to your computer via the original USB cable
In Windows Explorer navigate to the folder that contains your adb.exe and fastboot.exe
Win 7/8: Shift + right click and select "Open command window here".
For Win XP click here
select 'Run' from the Start menu, type
Code:
cmd
and hit Enter. In the resulting command prompt type
Code:
cd C:\adb\ [I](or whatever the path to your fastboot folder is..)[/I]
In the command window on your PC type:
Code:
fastboot devices
If that command returns a string of numbers and letters, you are good as gold.
Click me: View attachment 3070087
If it returns: "No devices found", fastboot is not working - yet - and you have to troubleshoot.
Getting the correct drivers working can be the hardest part of this exercise. If your computer does not "see" the tablet in fastboot, try to uninstall the existing driver (if any) in Device Manager and manually install the drivers I linked to above. And if Windows does not cooperate at all, PM me and I can hook you up with a Puppy Linux live CD with fastboot/adb set up already.
Let's assume everything is good:
On your computer go here: https://dl.twrp.me/tf300t/
Download the latest version of TWRP.
FYI ONLY: If, for whatever reason, you want to format your data partition:
Formatting /data starting with TWRP 2.7.x and later takes a lot longer than in previous versions (up to 90 minutes). LET IT FINISH. DO NOT INTERRUPT THE FORMATTING.
Rename the file to twrp.blob and place it into the same directory as your fastboot.exe. Note: More recent versions of TWRP download with an .img extension. Leave the extensions as is, rename the first part to watever is easy to type
Again check the connection with
Code:
fastboot devices
If you get the connection, in the command window type:
Code:
fastboot -i 0x0B05 flash recovery twrp.blob
or
Code:
fastboot -i 0x0B05 flash recovery twrp.img
This will flash the recovery to the recovery partition
If it is successful type:
Code:
fastboot reboot
and let the tablet boot up normally.
You may get a dialog in TWRP offering to root the stock rom. You can accept or cancel it - doesn't matter. I assume you are going to install a custom rom and they are rooted anyway.
Create a nandroid
Your almost there! You are now on the stock ROM with a custom recovery installed.
Power the tablet down and boot into the bootloader menu with Volume Down and Power buttons.
With RCK flashing, push Volume Up and you should boot into TWRP. Familiarize yourself with the many options of the touch based interface without executing anything yet. TWRP is very user friendly. You basically cannot do anything of consequence "by accident", so don't be shy.
To create your Nandroid (a full system backup) touch "Backup", leave the default selection as they are and swipe the button to create a nandroid of your current system.
This is a very healthy habit to develop: You always want to have a nandroid of your last working system squared away so that you can do a simple restore if you flash something that does not work, or something goes wrong during a flash. With a working recovery and a good nandroid you are minutes away from a working system if you soft brick your tablet.
Hint:
It's a good idea to have at least one good nandroid on external media. Sooner or later you will format your data partition and if you're like me, you may forget to backup your nandroids in the heat of the moment..
Installing a custom ROM
From here on out it's as easy as downloading the installation file of your custom ROM, booting into TWRP, choosing "Install" and navigating to the zip of the ROM you want to flash.
If you see a "signed" in the zip file name (best_rom_ever_signed.zip), make sure you check "verify zip signature" under the "Install" menu. Some devs sign their ROM zips - a better way to ensure file integrity than md5 sum.
Whatever you decide to flash: READ THE OP of the corresponding thread and make sure you have the correct bootloader and the required recovery installed! I can't stress this enough! If you are not sure, DO NOT FLASH!
Look for the ROMs in the Development section of the XDA forum for this tablet: http://forum.xda-developers.com/transformer-tf300t/development
It is mandatory to do a Factory Wipe in TWRP before installing a custom ROM or going from one ROM base to another (a so called clean install).
If you choose 'Wipe' in TWRP, all you have to do is swipe the button - 'Factory Wipe' is the default selection under the 'Wipe' menu. You will loose your apps, but it will not wipe your /data/media/ folder where your files, pictures, etc live.
If you do this right before flashing the custom ROM, make sure you have the zip file of your custom ROM on your microSD - not on your internal SD where it may get wiped....
Once you installed a custom recovery NEVER EVER UNDER ANY CIRCUMSTANCES - AND I REPEAT: NEVER! - use the 'Wipe Data' option from the bootloader menu or the "Factory Reset" option in Settings > Backup&Restore.
In your custom recovery you have the option to wipe, backup and restore every partition on your tablet selectively or collectively. Any wiping, any backup and any restore of the system, data, recovery or boot partitions MUST be done in your recovery (or in fastboot)!
You can safely use Titanium Backup or Asus Backup for apps and settings, but that's it. For everything else use your recovery.
FREE ADVICE
There are alternative methods to flash a recovery to your device using apps like GooManager (currently not supported anyway), TWRP Manager or Flashify from the Play Store which do it right from your tablet. These apps "save you the trouble" of getting ADB and fastboot set up and working on your PC. These methods still exist and they do work - mostly - and if you have root. But I would not recommend them.
If you are not willing to invest the time to learn the basics about ADB and fastboot (google "adb fastboot xda tutorial") and install the necessary drivers on your PC, you should not be flashing anything to your tablet!
GET ADB AND FASTBOOT WORKING!
Sooner or later you will do something stupid (I have done it and so will you) and ADB/fastboot may save your bacon IF you had it working when you didn't really need it.
Hit the 'Thanks' button and rate the thread 5 stars if this helped you
Click to expand...
Click to collapse

Save it for later

Mine

sbdags said:
@stamatis could we sticky this please.
Brilliant post Bernd :good:
Click to expand...
Click to collapse
Can we make that happen here to @stamatis
Thx Josh

Nice one Bernd! :good::good:

boot sequence
Hi,
Is normal to see three TUX and some phrases at the power on ?
Can I hide it ?
tnkx
Nicola

You mean the penguins?
That's normal I'd you're running a Rom that uses _that's preinit scripts. You can't hide them - why would you?

thank you SO much
I love you!
Wow, I've never had so much trouble rooting a device before! And days ago, I rooted my T700 without any problems. So, I guess I should have expected the hubby's TF300T to be problematic! Recoveries didn't work, I tried multiple ones. Eventually, I had a recovery that didn't recognize any partitions. I used fastboot to erase them all and put the stock ROM back on--wouldn't boot up. This thread was an immense help! I've moved the other recoveries and ROMs into my non-working folder!
Thanks again!
Lynne

Awesome
What a well written guide! I have a decent understanding of fastboot and adb (although minimal experience), and I perfectly understood every step.
My advice to all newbies like me.... Read stuff ALL of the way through (and understand it), BEFORE stepping off in it.

ok im a bit lost... i have rooted both Nexus 7s, nook hd and hd+, a tf101, and a few tv boxes.. so im not sure why this is hanging up... im trying to root and install the TWRP recovery on a tf300... followed the instructions and even have the char string that means... every thing should be good to go.... have checked that the twrp is in the dir of adb... but when i try to push the twrp.blob to the tf300, it just give me.. this error..
c:\adb>fastboot devices
015d14febf64041b fastboot
c:\adb>fastboot -i 0x0B05 flash recovery twrp.blob
sending 'recovery' (6800 KB)...
FAILED (command write failed (Invalid argument))
finished. total time: 0.002s
so.. at this point i not sure what else to trouble shoot... the tablet is in fastboot mode.. adb sees the tablet.. at least that is what the char string confirms.... so any help would be very much appreciated.. just a bit lost on this...
chris

scuzzo said:
ok im a bit lost... i have rooted both Nexus 7s, nook hd and hd+, a tf101, and a few tv boxes.. so im not sure why this is hanging up... im trying to root and install the TWRP recovery on a tf300... followed the instructions and even have the char string that means... every thing should be good to go.... have checked that the twrp is in the dir of adb... but when i try to push the twrp.blob to the tf300, it just give me.. this error..
c:\adb>fastboot devices
015d14febf64041b fastboot
c:\adb>fastboot -i 0x0B05 flash recovery twrp.blob
sending 'recovery' (6800 KB)...
FAILED (command write failed (Invalid argument))
finished. total time: 0.002s
so.. at this point i not sure what else to trouble shoot... the tablet is in fastboot mode.. adb sees the tablet.. at least that is what the char string confirms.... so any help would be very much appreciated.. just a bit lost on this...
chris
Click to expand...
Click to collapse
The bootloader is unlocked yes ?
What is your bootloader version ?
Try a different USB port ?
Thx Josh

lj50036 said:
The bootloader is unlocked yes ?
What is your bootloader version ?
Try a different USB port ?
Thx Josh
Click to expand...
Click to collapse
hello,
bootloader is unlocked or at least it says it is at the boot screen.. "your device is unlocked"..
real time... just swapped ports... its says it pushed the recovery.... so... will continue along this path.... and see how it goes.... i think its good to go... just as you suggested... port swap... cool... i bought this just so i could root it and put the kit kat kis rom on it.... thanks for your help and big ups to OP.... great guide ...
thanks again.!

Nice guide!
I've been wanting to put a custom rom on my transformer for a long time. This guide worked like a charm.
The only problem I had was when I tried to flash TWRP recovery, but switching USB port fixed that problem.
I flashed the latest CM12.1 nightly and it works fine.
Many thanks!

Help please, I'm stuck!
I'm trying to flash recovery,
after typing:
fastboot -i 0x0B05 flash recovery twrp.blob
I got this on tablet screen:
"Starting Fastboot USB download protocol"
for about 25-30 already and nothing happens, any ideas?
thanks

You won't see anything on the tablet screen, but what does the command window say?
Go back, read the guide again, it's all in there....
Sent from my K00C using Tapatalk

berndblb said:
You won't see anything on the tablet screen, but what does the command window say?
The command window didn't say anything, just blinking cursor after my command line
Go back, read the guide again, it's all in there....
Sent from my K00C using Tapatalk
Click to expand...
Click to collapse
Mishka79 said:
I'm trying to flash recovery,
after typing:
fastboot -i 0x0B05 flash recovery twrp.blob
I got this on tablet screen:
"Starting Fastboot USB download protocol"
for about 25-30 already and nothing happens, any ideas?
thanks
Click to expand...
Click to collapse
Thanks,
After writing the question, I've restarted my tablet and did all the steps again.
The second time everything worked as it should. :good:
thanks for your great guide

Really great guide
Amazing guide thanks for the help

Thank you for this good tutorial but I have one question.
I'm a newbie here, here is my dilemma: I've flashed CM android 5.1.1 successfully from stock 4.2. (Thanks for this detailed tutorial), but I lost my root privileges, now I can't use my root apps. How do I apply root to this ROM? My device is an ASUS TF300T. I've tried Kingo Root and King Root but no success.
I would really appreciate your help and inputs.
Cheers!

ANDROIDYER said:
I'm a newbie here, here is my dilemma: I've flashed CM android 5.1.1 successfully from stock 4.2. (Thanks for this detailed tutorial), but I lost my root privileges, now I can't use my root apps. How do I apply root to this ROM? My device is an ASUS TF300T. I've tried Kingo Root and King Root but no success.
I would really appreciate your help and inputs.
Cheers!
Click to expand...
Click to collapse
I have not used CM in quite a while but I think you have to enable root in Developer Options. I think it is not enabled by default.
If hat does not work you can go to Chainfire's website and download the flashable SuperSU and just flash it in recovery

Thanks and a couple of notes on TF300T
Thanks so much for the great guide. My 300TF was nearly bricked due to slowness and freeze-ups. I'd stopped using it. The process worked and am now running KatKiss. Couple of problems and their solutions for anyone who may have the 300TF:
-When trying to "Unlock Bootloader" I kept getting to "enter Google password" but when I did so (correctly) it was not accepted. The solution was to do another factory reset and NOT install google services. Didn't ask for password after that.
-Used fastboot command line to install "twrp.blob" but nothing happened and it timed out. I had to take out other usb connect programs first (in my case "easy-tether" and my LG phone connect app.) After that everything went as per your guide.
Thanks again
Geneg

Help really need here, big issues

Hello to everybody, so i was thinking my nakasi was really dead this time, the last thing i did was flashing a 5.1.1 rom next when i rebooted got stuck on lolipop boot loop so i restarted the tablet
manually to access the recovery, and to my awe, i couldn't no more access the recovery ! (latest twrp) tried again and again nothing, no recovery no bootloader, can't start the OS
always stuck on google logo with the options above, start, bootloader, recovery etc, today i realized i could access the bootloader and fastboot mode (ADB recognize my device when i type fastboot devices)
so i tried flashing stock image and stuff with no luck, tried many stock roms, tried wug's toolkit and the flash all.bat still no luck, i get all kind of error messages here is a screenshot, help is really appreciated if there is anything i can do to save it :
View attachment 3305126

the problem seems to be that i can't write the things i send to the tablet via ADB, tried the NVflash recovery today and got :
View attachment 3306049

Have you tried not imputing the full file address as you have the emulator already running from that location.
So recovery command would be.
Fastboot flash recovery "name of recovery Img file here"
Just make sure that the image file is in the platform-tools folder.
Probably not your issue but its going to save you some typing.
Good luck

gaosphappy said:
Have you tried not imputing the full file address as you have the emulator already running from that location.
So recovery command would be.
Fastboot flash recovery "name of recovery Img file here"
Just make sure that the image file is in the platform-tools folder.
Probably not your issue but its going to save you some typing.
Good luck
Click to expand...
Click to collapse
Thank you for the tip I'll certainly use it, but i don't think it is the culprit since as you can see in the screenshots
the files get sent successfully but cannot be written, my bootloader is unlocked by the way

Homurato said:
Thank you for the tip I'll certainly use it, but i don't think it is the culprit since as you can see in the screenshots
the files get sent successfully but cannot be written, my bootloader is unlocked by the way
Click to expand...
Click to collapse
Did you try the latest factory image? I noticed you are flashing a very old bootloader, possibly the first one? 4.23 is the current version.
Where is flatline_grouper.img coming from? I've never seen that.

adomol said:
Did you try the latest factory image? I noticed you are flashing a very old bootloader, possibly the first one? 4.23 is the current version.
Where is flatline_grouper.img coming from? I've never seen that.
Click to expand...
Click to collapse
Hello kind sir, of course at first i tried the 5.1.1 full factory image with the NRT toolkit and got the same writing errors next i tried many bootloaders
(one of them found it here as a 100% working bootloader) the Flatline is the recovery of the NVflash tool where you can access it to unbrick full bricked N7s
if you got blobs.bin of your N7 backed up (clearly not my case)
the flashing writing error i get it with everything i try to flash, recoverys bootloader system etc
when i send them with the flash all command they got sent to the tablet okay, but when writing i get the errors
i don't know but there is a small informations if that can help, before it broke my system was in EXT4 and all the rest in F2FS

It's entirely possible your memory has failed. I'm reading more and more people running into corrupted memory issues.
You can get a replacement motherboard cheap on eBay if nothing else works.

fwayfarer said:
It's entirely possible your memory has failed. I'm reading more and more people running into corrupted memory issues.
You can get a replacement motherboard cheap on eBay if nothing else works.
Click to expand...
Click to collapse
I'm still hoping for a software solution since my fastboot works fine, I'll let the motherboard solution my last i guess

Hello some news about the still staggering situations : when the tablet is off and i put the charger i get the battery refiling animation ! so that mean the bootloader isn't broken
and i still can access fastboot mode, even when i push a bootloader i get a signature match message, but the problem is still that the things i push can't be written as i'm still getting a :
FAILED <Remote: <FileWriteFailed>> changed usb cables, changed ports, the last time the tablet was working i had the system on EXT4 and the rest on F2FS, maybe if i can convert everything to EXT4 ?