Database Users

[Q] Nexus 7 Bootloader Issue

Long story short, I was trying out new kernels, got stuck in a boot loop, nothing would fix it, so I tried to restore back to stock rom. I did it manually in fastboot mode, but the bootloader .img would not write. It gave an error saying mismatched signatures. I redownloaded the image, I tried using a couple of different methods, like using toolkits and various commands, and finally, without thinking, erased the bootloader using the fastboot erase command with the intent of re-writing it, which obviously I can not do or I would no longer be here. It still boots, in the sense that I hear the notification on the computer that a device has been connected, but it shows up as NVidia APX in my list of devices on windows instead of Nexus 7 now, and the screen shows nothing. So... how screwed am I? If it is hopeless, is there any way to return/replace it (without using questionable methods)? Thanks.

Kaphix said:
Long story short, I was trying out new kernels, got stuck in a boot loop, nothing would fix it, so I tried to restore back to stock rom. I did it manually in fastboot mode, but the bootloader .img would not write. It gave an error saying mismatched signatures. I redownloaded the image, I tried using a couple of different methods, like using toolkits and various commands, and finally, without thinking, erased the bootloader using the fastboot erase command with the intent of re-writing it, which obviously I can not do or I would no longer be here. It still boots, in the sense that I hear the notification on the computer that a device has been connected, but it shows up as NVidia APX in my list of devices on windows instead of Nexus 7 now, and the screen shows nothing. So... how screwed am I? If it is hopeless, is there any way to return/replace it (without using questionable methods)? Thanks.
Click to expand...
Click to collapse
You flash your bootloader? That's the last thing one should do. We only need to unlock it, not flash it.

angellsl said:
You flash your bootloader? That's the last thing one should do. We only need to unlock it, not flash it.
Click to expand...
Click to collapse
It was already unlocked and rooted, etc, but I kept getting an error about it every time I tried flashing a rom, and the device wouldn't boot anyway, so I got frustrated and derped. I know that was pretty stupid, just wondering if there is any hope.

http://forum.xda-developers.com/showthread.php?t=1883737
sounds just like your situation... unfortunately you will most likely have to return/exchange/RMA

[Q] Dead Nexus 7 after OTA update

My rooted Nexus 7 recieved it's OTA to KitKat and after installation it's been stuck on KitKat logo boot just like many others out there. After trying to reset it and even trying to download kitkat image and use ADB I still can't get to install. I belive that CWM version 6.0.1.9) is the culprit. After sending the update file to it all I get is message that it can't find file.
Any help is appreciated. I can add that I am quite good with ADB and command line I just can't get it to find the file. If anybody can point me to a solution thread thank you in advance I don't mind reading and learning.
Regards

Mine failed also. It is soft bricked and it boots to the android on its back with 'no command' below. I can boot to boot loader, but not recovery. So far my attempts to use fastboot to flash stock have failed. I bought a replacement warranty with my Nuxus 7 and I may just give up and have it replaced under warranty. This nexus was not rooted or altered in any way...it was fully stock and the OTA failed.
Sent from my Nexus 7 using xda premium

I don't have extended warranty so...I still need a way to push a zip over to it and use CWM to install an OS to it.
EDIT: I seem to have a pritty good idea as to why I can't install OS. It appears that I don't have Nexus 7 MTP driver installed on my win7 machine. Any idea as to how to get that on without having a wirking Nexus 7 to plug it in and have win7 do it automagically ?

Problem solved. Mod can lock the thread.

Trying to unroot OnePlus Two and now its gone bad

So I was a noob when I first joined this to unlock my opt but now I have a nexus 6p and am trying to sell my opt. So i thought i might as well reset it back so that whoever buys it is not stuck with a rooted device if they don't want one. Well me not being so skilled with the processes I tried to unroot it through the command prompt and that worked but I couldn't factory reset it for some reason. So i tried to root it again and sell it as rooted because I'm sure someone would buy it like that but now it goes into a reboot loop where it shows the oneplus boot logo and shuts off and then shows it again. I'm able to get into fastboot mode but when I type in the command prompt about the status of the device it shows rooted as false and tampered as true so i think that i'm in trouble. SO i need help trying to get the tampered message to read false again and trying to get the device either back to a normal rooted or a normal unrooted state. Also should mention I think i did something to twrp so that its not showing up and I can't get into the recovery stage of the reboot. Any help would be wonderful!!!!

Check this thread, might be useful http://forum.xda-developers.com/showthread.php?t=3290707
[GUIDE][RESET][UNBRICK] Stock Reset to OxygenOS 2.2.0

If you are using Mac or Linux, Hit me up and I will guide you through how to do it on there. Otherwise the guide provided by @aymahalawa will get you there no problems at all.

Just flash twrp, first time make sure it boot in recovery then flash full zip for oxygen os
Sent from my ONE A2005 using Tapatalk

Thanks guys, I will try what @aymahalawa suggested, and I have windows

So finally followed the process and it worked after trying like 3 times!!!! currently selling on ebay if anyone is interested

[Q] Bricked Nexus 4

Hello Guys,
yesterday I restarted my Nexus 4, running the cm-13.0-20160520-NIGHTLY-mako. It stuck at the bootlogo, so I tried to reflash it in the twrp 2.8.7.0 recovery. But I got the error message "E:/ unable to mount /cache".
After that I was trying to solve this issue by wiping the cache, but I got the same error message -> The phone wasn't booting
From now on I did several things to solve my problem. I don't know the exact order.
- I've downloaded the Nexus Root Toolkit from WugFresh -> Tried to use the Flash Stock + Unroot Option with Soft-Bricked/Bootloop status enabled -> I choosed the 5.1.1 Factory Image -> In the cmd window, I get in every point the same error message "Falied (remote: flash write failure) -> I get the same message when I'm trying to manually flash each part of the factory image via fastboot
- Within the Toolkit I also tried to format cache, system and Userdata, but afther this I get the same error when trying to do the step before
- I think also used the Fastboot Flash options, but I'm not sure.
- After that I attempted to flash the cm13.zip via adb-sideload in TWRP. Here is a part from the error message I get:
"(...) could not detect filesystem for /dev/block/platform/msm_sdcc.1/by-name/system, assuming ext4
mount: failed to mount /dev/block/platform/msm_sdcc.1/by-name/system at /system: Invalid argument
unmount of /system failed: no such volume (...)
E: Error executing updater binary in zip 'sideload/package.zip'
E: Unable to mount '/data'
- In TWRP the Internal Storage is shown with 0mb
- Currently only the bootloader is working fine and I also can get a fastboot and adb connection to the phone
-> Loading the recovery is only possible by booting a recovery image in fastboot
Can somebody tell me if it is possible to restore my Nexus 4 and how to do it?
Thank you in advance :fingers-crossed:
PS: I hope I mentioned all the important points. If some information is missing, feel free to ask me.

Did you try to manually flash the latest rom?
Did you try to flash a stock 4.2 rom?
Tried different USB cables and USB ports?

audit13 said:
Did you try to manually flash the latest rom?
Did you try to flash a stock 4.2 rom?
Tried different USB cables and USB ports?
Click to expand...
Click to collapse
Thank you for your answer.
I tried to flash the newest cm13 in TWRP and with adb Sideload. I get the same error.
Also the 4.2 Stock rom doesn't work. Same problem as with the 5.1.1 factory image.
I also switched the cable and the USB ports, but it leads to the same error messages.

Try flashing the userdata.img file in fastboot. As soon as userdata finishes flashing, use the buttons to boot into recovery and perform a factory wipe. User the usedata.img file included with the stock ROM you flashed.

From what I see, your partitions got completely messed up. I reckon if it's fixable at all (assuming your chip ain't dead), the only thing that can fix it is fully reflashing everything via emergency mode. Now I can't seem to find the exact link, but I do know there was a thread on xda with instructions and everything. I'll keep digging around to see if I can find anything and then I'll link it here.

audit13 said:
Try flashing the userdata.img file in fastboot. As soon as userdata finishes flashing, use the buttons to boot into recovery and perform a factory wipe. User the usedata.img file included with the stock ROM you flashed.
Click to expand...
Click to collapse
I get the same error message as always: Falied (remote: flash write failure)
nerotNS said:
From what I see, your partitions got completely messed up. I reckon if it's fixable at all (assuming your chip ain't dead), the only thing that can fix it is fully reflashing everything via emergency mode. Now I can't seem to find the exact link, but I do know there was a thread on xda with instructions and everything. I'll keep digging around to see if I can find anything and then I'll link it here.
Click to expand...
Click to collapse
In Meanwhile I also think that my partitions are messed up. I saw one thread that could help me (http://forum.xda-developers.com/nexus-4/general/tutorial-how-to-unbrick-n4-t2347060), but some of the links are down.
Thank you for your help. :good:

Does the bootloader remain unlocked after rebooting? The emmc chip could be messed up and need replacement.

audit13 said:
Does the bootloader remain unlocked after rebooting? The emmc chip could be messed up and need replacement.
Click to expand...
Click to collapse
Unfortunately yes. After locking the bootloader via fastboot, the bootloader is marked as unlocked after rebooting.
Do I have to change the mainboard?

This confirms that the emmc chip is damaged and can only be fixed via a motherboard swap.
I had similar problems with two nexus 5 phones where I would unlock the bootloader but would always relock on reboot.

audit13 said:
This confirms that the emmc chip is damaged and can only be fixed via a motherboard swap.
I had similar problems with two nexus 5 phones where I would unlock the bootloader but would always relock on reboot.
Click to expand...
Click to collapse
Ok. Doesn't sound very good.
Nevertheless I will try the method of nerotNS, if he finds the thread.

tobi.king said:
I get the same error message as always: Falied (remote: flash write failure)
In Meanwhile I also think that my partitions are messed up. I saw one thread that could help me (http://forum.xda-developers.com/nexus-4/general/tutorial-how-to-unbrick-n4-t2347060), but some of the links are down.
Thank you for your help. :good:
Click to expand...
Click to collapse
Aye that's the thread I've been talking about. And yeah, the links are down for quite a while, I reckon the OP doesn't maintain it anymore. Anyways I used the tool once, I found all the files by Googling for like 4 hours or so - the most difficult one being the .dll file and getting the program itself to run. I'd upload them to you but there were on my C disk on my main rig and that got wiped when I reinstalled Windows :S I'm sure the files are on the net even now tho, I remember getting the .dll file from some Chinese website, Chrome's translator gave me enough info to actually download the file. Once I got it up and running the flash was OK, I've tested the method from that thread myself, the only problem is getting the files from the links that are down. I wish you good luck in your search for them, I know what an awful feeling it is for your nexus to die, my mako is still my daily driver, still kickin' ass
tobi.king said:
Ok. Doesn't sound very good.
Nevertheless I will try the method of nerotNS, if he finds the thread.
Click to expand...
Click to collapse
I did however have to change the motherboard out, since, while the flash was ok, the chip was not, so it didn't help much. I had an issue with my /data partition where it was completely gone, and the while filesystem got messed up, the only thing I could boot to was bootloader and even that only while on charger. Eventually I swapped my motherboard with a friends who didn't need her nexus 4 anymore and now it's ok. I suggest you first attempt the method from that link and if that fails, then you should resort to getting a new motherboard, but imo only if you can get it either dirt cheap or in a way like I did. Caching out around 100$ for a new nexus 4 mb, with phones like nexus 5X 32Gb costing 300$ is not a good investment if you ask me.

nerotNS said:
Aye that's the thread I've been talking about. And yeah, the links are down for quite a while, I reckon the OP doesn't maintain it anymore. Anyways I used the tool once, I found all the files by Googling for like 4 hours or so - the most difficult one being the .dll file and getting the program itself to run. I'd upload them to you but there were on my C disk on my main rig and that got wiped when I reinstalled Windows :S I'm sure the files are on the net even now tho, I remember getting the .dll file from some Chinese website, Chrome's translator gave me enough info to actually download the file. Once I got it up and running the flash was OK, I've tested the method from that thread myself, the only problem is getting the files from the links that are down. I wish you good luck in your search for them, I know what an awful feeling it is for your nexus to die, my mako is still my daily driver, still kickin' ass
I did however have to change the motherboard out, since, while the flash was ok, the chip was not, so it didn't help much. I had an issue with my /data partition where it was completely gone, and the while filesystem got messed up, the only thing I could boot to was bootloader and even that only while on charger. Eventually I swapped my motherboard with a friends who didn't need her nexus 4 anymore and now it's ok. I suggest you first attempt the method from that link and if that fails, then you should resort to getting a new motherboard, but imo only if you can get it either dirt cheap or in a way like I did. Caching out around 100$ for a new nexus 4 mb, with phones like nexus 5X 32Gb costing 300$ is not a good investment if you ask me.
Click to expand...
Click to collapse
I found all the necessary files for doing the method subscribed in the thread, but afther flashing the firmware nothing changed. Only thing that worked was the bootloader, everthing else still wasn't working.
Fortunately I had a broken Nexus 4 from a friend. So I switched both mainboards and my Phone is working again
Thank you for your help.

tobi.king said:
I found all the necessary files for doing the method subscribed in the thread, but afther flashing the firmware nothing changed. Only thing that worked was the bootloader, everthing else still wasn't working.
Fortunately I had a broken Nexus 4 from a friend. So I switched both mainboards and my Phone is working again
Thank you for your help.
Click to expand...
Click to collapse
Awesome, glad to be of service

Encryption unsuccessful

Running on stock 6.0.1 MMB29M
locked bootloader
after recovery reset, the phone went into " Encryption unsuccessful" screen. Even after press reset or do factory reset in recovery again, the phone still bootloop into this page.
Could someone help?
Thanks.

laofan said:
Running on stock 6.0.1 MMB29M
locked bootloader
after recovery reset, the phone went into " Encryption unsuccessful" screen. Even after press reset or do factory reset in recovery again, the phone still bootloop into this page.
Could someone help?
Thanks.
Click to expand...
Click to collapse
Hello... Try sideloading a full OTA of your choice from here: https://developers.google.com/android/ota#angler
It needs to be newer than the installed version. Not sure it will solve your issue though. Maybe someone else will chime in with a better solution...
If nothing works, RMA your device.
Good luck...

Thanks for the advice.
I tried to manually flash OTA but it falied because of the locked bootloader.
I am not sure if there is anyone could point me to do it via ADB. I tried using ADB but the phone is not recognized by my computer yet.
5.1 said:
Hello... Try sideloading a full OTA of your choice from here: https://developers.google.com/android/ota#angler
It needs to be newer than the installed version. Not sure it will solve your issue though. Maybe someone else will chime in with a better solution...
If nothing works, RMA your device.
Good luck...
Click to expand...
Click to collapse

laofan said:
Thanks for the advice.
I tried to manually flash OTA but it falied because of the locked bootloader.
I am not sure if there is anyone could point me to do it via ADB. I tried using ADB but the phone is not recognized by my computer yet.
Click to expand...
Click to collapse
Hey...
Reboot into Bootloader. Select recovery mode with the volume rocker and press power.
Once you see the Android guy laying down with his belly opened, press power and tap volume up once.
On the menu select: apply update from ADB
From here type in a command prompt:
adb sideload "name of the full OTA zip you downloaded without quote"
Supposing you have prior knowledge with ADB. Let me know if something is not clear here...
Good luck...

I finally get ADB recognized Nexus 6p. But the ota stop flash at 46%. failed to read command: No error.
5.1 said:
Hey...
Reboot into Bootloader. Select recovery mode with the volume rocker and press power.
Once you see the Android guy laying down with his belly opened, press power and tap volume up once.
On the menu select: apply update from ADB
From here type in a command prompt:
adb sideload "name of the full OTA zip you downloaded without quote"
Supposing you have prior knowledge with ADB. Let me know if something is not clear here...
Good luck...
Click to expand...
Click to collapse

laofan said:
I finally get ADB recognized Nexus 6p. But the ota stop flash at 46%. failed to read command: No error.
Click to expand...
Click to collapse
You might have to RMA. I believe "no command" means the emmc has died.

dieselbuddeh said:
You might have to RMA. I believe "no command" means the emmc has died.
Click to expand...
Click to collapse
That is too bad. The warranty was expired in January.... It can't be RMA.... I wished there are some hopes there

laofan said:
That is too bad. The warranty was expired in January.... It can't be RMA.... I wished there are some hopes there
Click to expand...
Click to collapse
Hello...
Try sideloading the 7.1.2 OTA. Nothing to loose... If it fails yet, sorry, I don't know what else to do.
Good luck..

laofan said:
That is too bad. The warranty was expired in January.... It can't be RMA.... I wished there are some hopes there
Click to expand...
Click to collapse
If you bought the phone direct from Google, you will likely get a one time exception.

v12xke said:
If you bought the phone direct from Google, you will likely get a one time exception.
Click to expand...
Click to collapse
Yes, call them anyway if you purchased from Google. I was 5 months out of warranty for my 6p and they replaced it because I was having battery issues.

5.1 said:
Hello...
Try sideloading the 7.1.2 OTA. Nothing to loose... If it fails yet, sorry, I don't know what else to do.
Good luck..
Click to expand...
Click to collapse
I almost tried all the major OTA, none of them could pass 46%... oh well......
v12xke said:
If you bought the phone direct from Google, you will likely get a one time exception.
Click to expand...
Click to collapse
tommyg562000 said:
Yes, call them anyway if you purchased from Google. I was 5 months out of warranty for my 6p and they replaced it because I was having battery issues.
Click to expand...
Click to collapse
It is not from google. And the warranty ended in January... I am fxxked.....

Probably so. There is one guy who found a 6P with a shattered screen for sale and paid a local repair shop to have the motherboard swapped out. Claims it cost him less than USD $100 but he is in South Korea. You're probably better off cutting your losses and finding another phone... after Huawei tells you NO three times.

v12xke said:
Probably so. There is one guy who found a 6P with a shattered screen for sale and paid a local repair shop to have the motherboard swapped out. Claims it cost him less than USD $100 but he is in South Korea. You're probably better off cutting your losses and finding another phone... after Huawei tells you NO three times.
Click to expand...
Click to collapse
posted it on craigslist now.
( I noticed that you are in the Woodlands area. I missed the time when I am in Houston. One of the best memories)

just a follow-up to somebody might see encounter the same thing. I was not able to fix the phone.
With a locked bootloader and "encryption unsuccessful" page, you might try warranty first. If that does not work, you might want to take rescue OTA from google and flash it in recovery via " install update via ADB".
Please be aware that rescue OTA is different from system image and should be flash via ADB in recovery.
Good luck.

laofan said:
just a follow-up to somebody might see encounter the same thing. I was not able to fix the phone.
With a locked bootloader and "encryption unsuccessful" page, you might try warranty first. If that does not work, you might want to take rescue OTA from google and flash it in recovery via " install update via ADB".
Please be aware that rescue OTA is different from system image and should be flash via ADB in recovery.
Good luck.
Click to expand...
Click to collapse
Hello,
What rescue OTA? Something different than the usual OTA you would sideload with ADB?
Cheers...

5.1 said:
Hello,
What rescue OTA? Something different than the usual OTA you would sideload with ADB?
Cheers...
Click to expand...
Click to collapse
Here are Rescue OTA. One would need to flash it with ADB in recovery. https://developers.google.com/android/ota
The following one is firmware/factory image. One would need to flash it with fastboot while in bootloader mode : https://developers.google.com/android/images
Use the correct zip file according to your flashing mode ( recovery or bootloader)

laofan said:
Here are Rescue OTA. One would need to flash it with ADB in recovery. https://developers.google.com/android/ota
The following one is firmware/factory image. One would need to flash it with fastboot while in bootloader mode : https://developers.google.com/android/images
Use the correct zip file according to your flashing mode ( recovery or bootloader)
Click to expand...
Click to collapse
Hello,
I see nothing different than hmm an OTA here. I thought that was a "special" OTA, but no.
Not sure why it's called rescue OTA, lol.
Thanks for the links, but i know exactly what an OTA and a factory image are. :good:
Thanks...

Hello!
I have the same "Encryption unsuccessful" issue. It happened many times recently. First I replaced the battery, because it produced early sudden shutdown at 30-40%, and could run only for a few hours from 100% to 40%.
The new battery is enough for 30-40 hours as I use it, and can operate the phone down to 1-2% before shutting down.
But if I have to restart the phone, the encryption unsuccessful problem still comes up randomly after battery replacement. I can restart several times without problem, then randomly just fails. Mostly after software updates I guess... I have stock firmware, stock rom, etc. the only thing was made that I have installed TWRP, and wiped user data. Hope that helps. Can it be the defect of the emmc ? If so, how shall I diagnose it?
I'm very newbie android user, I changed from Windows Phone ( ) only a few months ago...
The question is what could cause the Encryption unsuccessful error? It's interesting, that if I enter any random numbers as unlock code, the phone tells that it appears to be valid, but unfortunately cannot decrypt data.
So I would like only to disable forced encryption, maybe that helps. Could someone point me to the right direction about what exactly should I do? Is it enough to flash a modded kernel to disable encryption? I don't want to root, or experiment with custom roms and I would stick to the factory firmware as much as I can, but without encryption of corse...
thanks!

fredmoro said:
Hello!
I have the same "Encryption unsuccessful" issue. It happened many times recently. First I replaced the battery, because it produced early sudden shutdown at 30-40%, and could run only for a few hours from 100% to 40%.
The new battery is enough for 30-40 hours as I use it, and can operate the phone down to 1-2% before shutting down.
But if I have to restart the phone, the encryption unsuccessful problem still comes up randomly after battery replacement. I can restart several times without problem, then randomly just fails. Mostly after software updates I guess... I have stock firmware, stock rom, etc. the only thing was made that I have installed TWRP, and wiped user data. Hope that helps. Can it be the defect of the emmc ? If so, how shall I diagnose it?
I'm very newbie android user, I changed from Windows Phone ( ) only a few months ago...
The question is what could cause the Encryption unsuccessful error? It's interesting, that if I enter any random numbers as unlock code, the phone tells that it appears to be valid, but unfortunately cannot decrypt data.
So I would like only to disable forced encryption, maybe that helps. Could someone point me to the right direction about what exactly should I do? Is it enough to flash a modded kernel to disable encryption? I don't want to root, or experiment with custom roms and I would stick to the factory firmware as much as I can, but without encryption of corse...
thanks!
Click to expand...
Click to collapse
Same. The data decryption being unsuccessful happened to me as well on stock oreo 8.1.0. not rooted
Anyone know how to fix it and doesn't happen again?
Thanks