Can't boot to bootloader - Nexus 7 Q&A, Help & Troubleshooting

I recently got the update for 4.4 notification, clicked it but then the installation froze on a picture of android with an exclamation in his belly.
After that I could no longer boot to bootloader or recovery.
I tried fastboot but I cant not install the drivers as I cant boot to bootloader.
So I tried NRT and managed to get my recovery back (TWRP), but still no bootloader.
I have the option to return to stock on NRT but I am afraid it will fail and brick my N7.
I have SuperSU, flashify and TWRP apps running now with TWRP recovery also bootable.
How can I get my bootloader back?

Siddy1200 said:
I recently got the update for 4.4 notification, clicked it but then the installation froze on a picture of android with an exclamation in his belly.
After that I could no longer boot to bootloader or recovery.
I tried fastboot but I cant not install the drivers as I cant boot to bootloader.
So I tried NRT and managed to get my recovery back (TWRP), but still no bootloader.
I have the option to return to stock on NRT but I am afraid it will fail and brick my N7.
I have SuperSU, flashify and TWRP apps running now with TWRP recovery also bootable.
How can I get my bootloader back?
Click to expand...
Click to collapse
Hi, Siddy1200...
If you had no bootloader... nothing would work... at all.
The bootloader underpins everything you do with your Nexus 7. Nothing happens without one... in which case , you'd be effectively HARDBRICKED.
The fact that stuff is working indicates that your bootloader is fine.
To access the bootloader manually... shut down the Nexus 7 completely.
Press and hold the VOL DOWN button...
Whilst holding, press the POWER ON button, for around 5-10 seconds...
You should now boot into the bootloader.
This key press sequence should also work if you CAN'T shut down the Nexus 7 normally... for example, if you're bootlooping. I've had a few scary moments myself in the past, and the VOL DOWN+hold, POWER ON sequence has always thrown me back into the bootloader...
Rgrds,
Ged.

GedBlake said:
Hi, Siddy1200...
If you had no bootloader... nothing would work... at all.
The bootloader underpins everything you do with your Nexus 7. Nothing happens without one... in which case , you'd be effectively HARDBRICKED.
The fact that stuff is working indicates that your bootloader is fine.
To access the bootloader manually... shut down the Nexus 7 completely.
Press and hold the VOL DOWN button...
Whilst holding, press the POWER ON button, for around 5-10 seconds...
You should now boot into the bootloader.
This key press sequence should also work if you CAN'T shut down the Nexus 7 normally... for example, if you're bootlooping. I've had a few scary moments myself in the past, and the VOL DOWN+hold, POWER ON sequence has always thrown me back into the bootloader...
Rgrds,
Ged.
Click to expand...
Click to collapse
Thanks for the reply Greg.
I can't boot to boot loader, that means when I power on with vol- pressed, then select boot loader and press power , it doesn't work. The screen flashes for a second and it is back to the previous screen to where I can choose restart, recovery, boot loader,etc.
This also happened with recovery but I fixed it, now I'm trying to fix the bootloader

Siddy1200 said:
Thanks for the reply Greg.
I can't boot to boot loader, that means when I power on with vol- pressed, then select boot loader and press power , it doesn't work. The screen flashes for a second and it is back to the previous screen to where I can choose restart, recovery, boot loader,etc.
This also happened with recovery but I fixed it, now I'm trying to fix the bootloader
Click to expand...
Click to collapse
Apologies, Siddy1200... but I'm a little confused... based upon my reading of your post... I think you're already in the bootloader!!.
"...it is back to the previous screen to where I can choose restart, recovery, boot loader,etc..."
The bootloader features a green android, lying on its back, with it's belly open - some really tiny text at the lower left hand side of the screen giving details about the current bootloader version and it's lock state. At the upper right hand side of the screen, adjacent to the power button, are selectable options via the POWER BUTTON, which can be cycled through with the VOL BUTTONS... and these options are START, RESTART BOOTLOADER, RECOVERY MODE, POWER OFF... and then START again.
Somewhat similar to your above quoted description.
Selecting RESTART BOOTLOADER will just bring you back to where you already are... ie., the BOOTLOADER.
Also, if you can't access the bootloader, how are you managing to boot into TWRP?... as this is normally done via the bootloader... ie, by selecting the RECOVERY MODE option.
Rgrds,
Ged.

GedBlake said:
Apologies, Siddy1200... but I'm a little confused... based upon my reading of your post... I think you're already in the bootloader!!.
"...it is back to the previous screen to where I can choose restart, recovery, boot loader,etc..."
The bootloader features a green android, lying on its back, with it's belly open - some really tiny text at the lower left hand side of the screen giving details about the current bootloader version and it's lock state. At the upper right hand side of the screen, adjacent to the power button, are selectable options via the POWER BUTTON, which can be cycled through with the VOL BUTTONS... and these options are START, RESTART BOOTLOADER, RECOVERY MODE, POWER OFF... and then START again.
Somewhat similar to your above quoted description.
Selecting RESTART BOOTLOADER will just bring you back to where you already are... ie., the BOOTLOADER.
Also, if you can't access the bootloader, how are you managing to boot into TWRP?... as this is normally done via the bootloader... ie, by selecting the RECOVERY MODE option.
Rgrds,
Ged.
Click to expand...
Click to collapse
Thanks for your persistence Greg, I think I was confused as what the bootloader actually is, now I can see I am already in bootloader :silly:
I will return to stock with NRT and try the 4.4 update now.

Related

[Q] bootloader issues

I am trying to get into the bootloader of my device by pushing up and power but it vibrates twice, nothing comes up and the orange led keeps blinking
I got into the stock recovery on accident, and it wiped my bootloader? I did the temp root and tried to push the engineering bootloader it still won't work.
edit: nevermind. LOL
_ice_ said:
I am trying to get into the bootloader of my device by pushing up and power but it vibrates twice, nothing comes up and the orange led keeps blinking
I got into the stock recovery on accident, and it wiped my bootloader? I did the temp root and tried to push the engineering bootloader it still won't work.
Click to expand...
Click to collapse
To get to the bootloader, you hold Volume Down and Power. (The jury is still out on what Volume Up and Power does.)
The stock recovery first shows an image of a handset inside a triangle with an exclamation point, or something like that. Pressing Volume Up and Power then reveals the recovery menu. I assume you'll be replacing that with a custom recovery image soon.
If you did the command properly to flash the engineering bootloader, then your device should boot up and you'll see hboot 0.85.2007 on the second line of your bootloader. If your device doesn't boot, then I'm afraid you're screwed.
jdkoren said:
To get to the bootloader, you hold Volume Down and Power. (The jury is still out on what Volume Up and Power does.)
The stock recovery first shows an image of a handset inside a triangle with an exclamation point, or something like that. Pressing Volume Up and Power then reveals the recovery menu. I assume you'll be replacing that with a custom recovery image soon.
If you did the command properly to flash the engineering bootloader, then your device should boot up and you'll see hboot 0.85.2007 on the second line of your bootloader. If your device doesn't boot, then I'm afraid you're screwed.
Click to expand...
Click to collapse
HAHAH I know lol. I was pressing the wrong button sequence. medicine and lack of sleep does this..
The fail whale!
▄██████████████▄▐█▄▄▄▄█▌
██████▌▄▌▄▐▐▌███▌▀▀██▀▀
████▄█▌▄▌▄▐▐▌▀███▄▄█▌
▄▄▄▄▄██████████████▀

[Info] Guide to entering safe mode, bootloader, stock recovery

Yes, I know, everyone knows how to enter safe mode, bootloader, and recovery.
I found there are some inconsistencies to entering and using recovery depending on your which software you are running. In addition there are multiple ways of entering stock recovery.
Also I always see people asking this question because somehow the keypress order is not intuitive.
Entering Safe Mode
Tablet booted and running Android
Press/Hold Power button until power menu shows up
Tap/Hold Power off option
Choose OK to reboot in safe mode
Tablet powered down
Press/Hold Power button until Google screen shows up, RELEASE Power button
Press/Hold VolDn until Android has booted up
If successful, you will see Safe mode overlayed on bottom left of screen.
Entering Bootloader (ie fastboot mode)
Tablet booted and running Android
From adb
adb reboot bootloader
can also choose recovery from menu after bootloader comes up
From app
Use Quick Boot from Google Play
Tablet powered down
Power+VolDn while booting to enter bootloader
Release buttons after you see bootloader screen
Entering Stock Recovery
Tablet booted and running Android
From adb
adb reboot recovery
From app
Use Quick Boot from Google Play
Tablet powered down
Power+VolUp while booting to enter recovery
You can release buttons after you see Google on screen
When Stock Recovery starts you will see the Android fallen down screen
To bring up the Recovery menu
Power+VolUp to show recovery menu
Must be this sequence Press/Hold Power, THEN Press/Release VolUp, release Power
Within menu
VolUp to move up
VolDn to move down
Power to select
In addition, I found an inconsistency with JSS15J stock recovery that wasn't in the JWR66N recovery
While at the Android fallen down screen if you mistakenly press
VolUp
instead of
Power+VolUp
you will still get the Recovery menu.
However, VolUp will no longer function. It will instead become a toggle for switching between the Recovery menu and the Android fallen down screen
Android fallen down screen
VolUp to toggle recovery menu
Within menu
VolUp does not work since it toggles recovery menu
VolDn to move down
Power to select
sfhub said:
Entering Stock Recovery
Tablet booted and running Android
From adb
adb reboot recovey
Click to expand...
Click to collapse
Are you sure with this command. I think it must be => adb reboot recovery <= or am I wrong ???
pRo_lama said:
Are you sure with this command. I think it must be => adb reboot recovery <= or am I wrong ???
Click to expand...
Click to collapse
Sorry, typo, fixed.
i`m on completely stock JSS15Q and i cant get into stock recovery. When im trying i see "no command" and red exclamation mark on the laying robot. What should i do?
laska300 said:
i`m on completely stock JSS15Q and i cant get into stock recovery. When im trying i see "no command" and red exclamation mark on the laying robot. What should i do?
Click to expand...
Click to collapse
sfhub said:
Entering Stock Recovery
Tablet powered down
Power+VolUp while booting to enter recovery
You can release buttons after you see Google on screen
When Stock Recovery starts you will see the Android fallen down screen
To bring up the Recovery menu
Power+VolUp to show recovery menu
Must be this sequence Press/Hold Power, THEN Press/Release VolUp, release Power
Within menu
VolUp to move up
VolDn to move down
Power to select
Click to expand...
Click to collapse
Please see RED section
Does the presence or absence of the red exclamation triangle mean anything?
Wot does safe mode do?
Anderson2 said:
Does the presence or absence of the red exclamation triangle mean anything?
Click to expand...
Click to collapse
I don't remember if there are two images one with and one without the triangle. I think I've only seen the image with the red exclamation point.
I've never seen anything to indicate the red exclamation mark is something you need to pay attention to.
Now if you apply an update and there is an error, then that is something I would pay attention to.
LoVeRice said:
Wot does safe mode do?
Click to expand...
Click to collapse
It doesn't load the stuff you added.
It is similar to safe mode on a PC, used to diagnose whether the issue is in the stock ROM or is in something you introduced by installing some app.
I Have a probleme
since a bought TAB 3 10.1 and it's boot into safe mode i'v restart it and turrn it off the back on but it didn't go what should i do ?
This thread is about nexus 7.
sfhub said:
This thread is about nexus 7.
Click to expand...
Click to collapse
oh sorry i was panic so i searched in every thing
Bootloader
If none of that works, try the command with a dash "adb reboot-bootloader" Depends on your device sometimes, sometimes unplugging your device right after you enter this command will keep it from getting stuck at the boot logo screen. If that doesn't work, hold the power button to power device down and then boot it into recovery instead using the button combo. Then you can wipe cache & start all over again.
I'm not even able to get into Recovery. I can get to the bootloader, then I select "Recovery mode" and it shows the Google logo, but it never goes into recovery. I have let it sit at the Google logo for a couple of hours, and end up just holding down the power button to shut it down.
I have tried Skipsofts toolkit, as well as Wug's, to try to unlock the bootloader. This ends up with the device hanging at the "Unlock bootloader" screen after selecting "Yes". Again, I have left it in this state for well over an hour with no change.
Here's some info on my 2013 Nexus 7:
KitKat 4.4.4
Never rooted
Never unlocked bootloader
HW version rev-e
Bootloader version FLO-04.02
I suspect my Nexus knew I was supposed to go on travel next week and is faking sick.
Any help would be appreciated. Thanks.
Hi guys i have a google nexus 5 and it is locked state. It is getting booted again and again but it jiust reaches google logo and again restarts. Safe boot is also enabled so i cant enter in recovery mode also. Please help me ASAP.

Can't get into recovery mode

Here's my problem.
I can't get into recovery by pressing the power up, home, power buttons. It says it's 'entering recovery', but then it gives another 'buzz' (like when the phone starts), and just reboots normally.
I used to be able to get into recovery with ROMManager, by selecting the 'boot into recovery'. Then I just got into my CWM and could do whatever I wanted. Now I can't do that anymore, probably because my device is not rooted atm (got CM12 on it though). I wanted to root it, but I can't get into recovery.
I already tried flashing TWRP with Odin (download mode does work), but that doesn't work either. I obviously searched google and XDA for the problem, and I saw suggestions for other phones, like updating the bootloader. But I can't find any information or files for updating the bootloader.
sebas156 said:
Here's my problem.
I can't get into recovery by pressing the power up, home, power buttons. It says it's 'entering recovery', but then it gives another 'buzz' (like when the phone starts), and just reboots normally.
I used to be able to get into recovery with ROMManager, by selecting the 'boot into recovery'. Then I just got into my CWM and could do whatever I wanted. Now I can't do that anymore, probably because my device is not rooted atm (got CM12 on it though). I wanted to root it, but I can't get into recovery.
I already tried flashing TWRP with Odin (download mode does work), but that doesn't work either. I obviously searched google and XDA for the problem, and I saw suggestions for other phones, like updating the bootloader. But I can't find any information or files for updating the bootloader.
Click to expand...
Click to collapse
Reboots trying to go custom recovery are normal sometimes.
Lil guide for enter custom recovery (TWRP):
1. Power off your device completely.
2. Press and hold Volume Up, Home and Power buttons simultaneously.
3. Release only the Power button when the logo of Samsung in white appears (you will see little letters in blue and red on the top left of the screen).
4. You will see the blue logo of TWRP (pic attached) then and you can release all buttons and start to navigate for the custom recovery.
Joku1981 said:
Reboots trying to go custom recovery are normal sometimes.
Lil guide for enter custom recovery (TWRP):
1. Power off your device completely.
2. Press and hold Volume Up, Home and Power buttons simultaneously.
3. Release only the Power button when the logo of Samsung in white appears (you will see little letters in blue and red on the top left of the screen).
4. You will see the blue logo of TWRP (pic attached) then and you can release all buttons and start to navigate for the custom recovery.
Click to expand...
Click to collapse
Thanks for the reply, but I don't think you understood my question. I know how to get into recovery when it all works. I've done it many times before. The problem is that it shuts down while booting into recovery, and then just reboots normally.
I only installed TWRP because CWM wouldn't work, but TWRP doesn't either. So I guess it has to do with how the device boots into recovery, regardless of what the recovery is.
Anyone? I kinda want to flash another ROM, but I'm unable to right now.
sebas156 said:
Anyone? I kinda want to flash another ROM, but I'm unable to right now.
Click to expand...
Click to collapse
hi
Check your power button.....it happened before , a defective power botton will make it hard to enter recovery or download mode
MAX 404 said:
hi
Check your power button.....it happened before , a defective power botton will make it hard to enter recovery or download mode
Click to expand...
Click to collapse
I don't think that's the problem. I have 0 issues with the power button. Also, when I try to boot into recovery, it actually says it's 'starting recovery'. Then it stops with a buzz and reboots.
sebas156 said:
I don't think that's the problem. I have 0 issues with the power button. Also, when I try to boot into recovery, it actually says it's 'starting recovery'. Then it stops with a buzz and reboots.
Click to expand...
Click to collapse
may be one of the other push buttons.....
try to get into recovery with out pressing the power button and see if is possible...if so then the problem is coming from there.

Stuck in "Erasing"

I went to factory reset my completely stock and never rooted Nexus 10. It rebooted in to recovery and started "Erasing". It did this for a few hours. If I power it down, it will power back up and go right back to "Erasing" and never erase. If I hold power and volume up on this Erasing screen, I can see "Erasing /data", but it never shows any other status. I cannot boot in to recovery, it will only go to the Erasing screen - I never get the recovery menu. I can boot in to fastboot, but I cannot get the fastboot cli program to recognize the device. I've tried installing drivers for it multiple ways with no success. I figure if I can get in to fastboot I should be able to fix this device, but I'm stuck. Can anyone help?
No one can help here?
ganiman said:
I went to factory reset my completely stock and never rooted Nexus 10. It rebooted in to recovery and started "Erasing". It did this for a few hours. If I power it down, it will power back up and go right back to "Erasing" and never erase. If I hold power and volume up on this Erasing screen, I can see "Erasing /data", but it never shows any other status. I cannot boot in to recovery, it will only go to the Erasing screen - I never get the recovery menu. I can boot in to fastboot, but I cannot get the fastboot cli program to recognize the device. I've tried installing drivers for it multiple ways with no success. I figure if I can get in to fastboot I should be able to fix this device, but I'm stuck. Can anyone help?
Click to expand...
Click to collapse
I know the Nexus 10 takes longer to do stuff like that than other devices but I have never had it stuck on erasing for hours. If you hold down the power button long enough, will it reboot? If you can time it right, you should be able to hold the Power + Volume up + Volume down and hopefully get into the recovery. I think it has to be all three buttons. Not just Volume up. At least that takes me to the bootloader screen.
jsgraphicart said:
I know the Nexus 10 takes longer to do stuff like that than other devices but I have never had it stuck on erasing for hours. If you hold down the power button long enough, will it reboot? If you can time it right, you should be able to hold the Power + Volume up + Volume down and hopefully get into the recovery. I think it has to be all three buttons. Not just Volume up. At least that takes me to the bootloader screen.
Click to expand...
Click to collapse
If I hold in power, it will reboot. It does not stay powered down. And when it comes up, it goes right in to "Erasing" again. I thought volume down as Fastboot and Up was Recovery (or maybe the other way around). I will try holding in both volume up/down at the same time instead. I might have tried it in my rage when this happened, but can't remember, so will try it for sure when I charge it back up again (it eventually stops because the battery just dies).
ganiman said:
If I hold in power, it will reboot. It does not stay powered down. And when it comes up, it goes right in to "Erasing" again. I thought volume down as Fastboot and Up was Recovery (or maybe the other way around). I will try holding in both volume up/down at the same time instead. I might have tried it in my rage when this happened, but can't remember, so will try it for sure when I charge it back up again (it eventually stops because the battery just dies).
Click to expand...
Click to collapse
I've always held all three buttons with my Nexus devices and it takes me to the bootloader. You could be right about volume down being Fastboot and Up being Recovery but I'm not 100% sure. There should be a way of getting out of that though. If you just did a factory reset, I don't think it would have messed with recovery or anything.
jsgraphicart said:
I've always held all three buttons with my Nexus devices and it takes me to the bootloader. You could be right about volume down being Fastboot and Up being Recovery but I'm not 100% sure. There should be a way of getting out of that though. If you just did a factory reset, I don't think it would have messed with recovery or anything.
Click to expand...
Click to collapse
From https://source.android.com/source/running.html#booting-into-fastboot-mode
Booting into fastboot mode
During a cold boot, the following key combinations can be used to boot into fastboot mode, which is a mode in the bootloader that can be used to flash the devices:
manta Press and hold both Volume Up and Volume Down, then press and hold Power
Hopefully, this thread is still followed....
So, about 6mos ago, my Nexus 10 stopped working and I couldn't get it back working...eventually moved onto a new tablet, which now I hate....
Anyway, I figured I'd head back to my N10 because I loved it. However, one of the reasons I left it was because it was stuck in bootloop and I was pretty sure it was bricked.
The bad news, I have followed MANY, if not ALL, of the suggestions on getting it back, I just cannot get it to boot. The good news, fastboot connects with the tablet. So, some specifics:
The tablet WILL boot into fastboot and I can send commands and the tablet is unlocked (also, I believe someone said they had issues because they had an older version of ADB and Fastboot. I'm pretty sure I downloaded the 'most current' version 1.4.3). So, with that, I was able to do the fastboot erase functions, such as cache, userdata, system, etc... and then also load the bootloader (mantafm01) and also send the stock .zip file (image-mantaray-....) and the tablet appears to load everything fine. Thumbs up, right? However, when it reboots it stops at the 'erasing' android bot and will not pass that. I left the tablet in that state for a few minutes all the way up to 3 days...no success.
I also tried the above using Wugfresh only to have the same thing occur. So, basically, I am stuck at 'erasing' and I don't know what to do. I feel confident that the tablet has the ability to be brought back to life, I just cannot figure out how/why all of the attempts lead to the same issue.
What I can also tell you is that while fastboot 'sees' the tablet, the tablet does not appear as a device in "My Computer" like it normally did when connecting via USB. I am using the original USB cable and have tried on multiple computers, all to no avail. I've downloaded/installed the drivers, as instructed on many links. Also, while I can get to the 'Recovery Mode' by pressing Power, Volume Up, Volume Down, if I choose "Recovery Mode" on the tablet, it reboots and goes to the 'erasing' screen. I have tried flashing TWRP on the tablet using fastboot as well. And, sometimes, not all the time, the TWRP blue/black screen appears but it will not progress past that screen (i.e., it doesn't go into recovery).
So, if you can, please help. I believe I have followed all of the instructions, but I have to be missing something or not following something correctly. I'm stoked that it looks like it's only soft-bricked, I just can't get it un-bricked.
Thanks in advance!

Update to marshmallow failed

I'm stock 5.1.1, unrooted but bootloader unlocked. Tried updating with ota but ran through the stock recovery Android booted and it said update failed. Do i have to relock the bootloader? Again, im NOT rooted.
NexusS4gFreak said:
I'm stock 5.1.1, unrooted but bootloader unlocked. Tried updating with ota but ran through the stock recovery Android booted and it said update failed. Do i have to relock the bootloader? Again, im NOT rooted.
Click to expand...
Click to collapse
Also, when I tried booting into recovery manually, after the bootloader unlocked warning screen came up, it went to what was supposed to be there stck recovery but instead was the dead (lying down) Android with this words "No Command" over him. That's all, no other anything. I Powered off and booted back into Android.
BTW, got the phone second hand....
Download 6.0 and flash in fastboot.
You can also use my thread, but remember, there provided files are for EU version of Moto X Style. If you are using another device, steps will remain the same, but you will need files for your device!
Thread is found here.
NexusS4gFreak said:
Also, when I tried booting into recovery manually, after the bootloader unlocked warning screen came up, it went to what was supposed to be there stck recovery but instead was the dead (lying down) Android with this words "No Command" over him. That's all, no other anything. I Powered off and booted back into Android.
Click to expand...
Click to collapse
The dead Android is stock recovery. Hold the power button then tap the vol + button. That will take you into the recovery menu.
From LenoMoto:
Code:
With the phone powered off, press and hold the Volume Down button and the Power button at the same time until the device turns on.
Press the Volume Down button to highlight "Recovery mode"
Press the Power button to restart into Recovery mode.
You'll see an image of an Android robot with a red exclamation mark.
While holding down the Power button, press the Volume Up button.

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