[Q] Cannot Unlock Bootloader, Bricked Tablet - Nexus 7 Q&A, Help & Troubleshooting

Hey Guys,
Hoping someone can help here, I have followed various tutorials I have found on the internet to try and restore my Nexus 7 back to its factory state after it one day decided to never get past the white Google logo.
Inevitably I ended up on this tutorial as the only one where I seemed to get any kind of a link and response with the tablet: blog.laptopmagDOTCOM/how-to-hard-reset-a-bricked-nexus-7-with-your-pc
basically it got as far as trying to Unlock the Bootloader, but it fails to do so. I do get the popup on the tablet asking if I want to unlock it but nothing happens, it remains locked after I click Yes. My command line saying that it Failed.
All other tutorials seem to assume you can access the OS and enable debug mode but of course I cannot. I cannot even do a Factory Reset, every options eventually leading me to a white Google logo.
I also cannot get into recovery mode, im just stuck on the screen with the green android and the option to Start, Recovery mode etc all just lead to the Google logo.
The impression I have gotten from not being able to unlock the bootloader is that there must be a hardware failure? could anyone suggest some black magic I might be able to do to fix it? I realise at some point I should cut my losses. I had also wondered if it was worth buying a new motherboard/logic board?
Would appreciate any help.
Cheers,
Matt.

Have you tried this tools:
http://forum.xda-developers.com/showthread.php?t=1766475
or
http://forum.xda-developers.com/showthread.php?t=1809195
Both are magic tools for nexus 7, please read any explanation carefully!
It may help you :good:

ju1da said:
Have you tried this tools:
http://forum.xda-developers.com/showthread.php?t=1766475
or
http://forum.xda-developers.com/showthread.php?t=1809195
Both are magic tools for nexus 7, please read any explanation carefully!
It may help you :good:
Click to expand...
Click to collapse
Wow.....
Please stop spamming the toolkits.
The op has indicated that there is a hardware issue because the bootloader unlock isn't working.. A stupid toolkit isn't going to fix that. You should are promoting people to use their damn brains and doing it the right way, but laziness prevails, eh?
To the op, sorry but it sounds like you have a corrupt emmc. If the unlock process fails to commit, that's a bad sign.
Sent from my Nexus 5

Also to the op, USB debugging has nothing to do with the bootloader or recovery, only a booted os. Can you boot to recovery from the bootloader?
Sent from my Nexus 5

Related

I think I bricked my nexus (my fault) please help!

Hello all,
I think I may have bricked my nexus one. It is completely my fault for attempting things that I knew little about, so flame away But after the flaming, if anyone is willing to help I would be sooooo thankfull...
I successfully rooted my phone following the instructions on this page: (all links edited with a double asterisk as I don't believe I can post links)
h**p://theunlockr.com/2010/01/02/how-to-root-the-nexus-one/
Then successfully installed cyanogenmod (which is awesome!) following this page:
h**p://theunlockr.com/2010/01/08/how-to-load-a-custom-rom-on-the-nexus-one/
All was well, I even got the modaco desire rom up and running, and was happily switching back and forth using the recovery screen. I had nand backups for specific setups, etc.
Then I decided it would be good to know how to go back to stock, and found this page:
h**p://**w.androidspin.com/2010/05/06/guide-unrooting-your-nexus-one-its-like-it-never-happened-almost/
I followed the instructions to the letter (I think) except for erasing userdata (it said "failed: remote not allowed"). I thought that things would be ok, since I'd recently wiped, so I followed the page till the end.
The phone rebooted, and I got the original nexus boot animation - but it's in an endless loop! What's worse, it that now when I try to go to the bootloader or recovery mode, I get the exclamation triangle with the little android.
Is there any way through a command prompt (or other method) that I can fix this? I tried to re-flash the RA recovery image through the command prompt, but the response was, "waiting for device."
ANYTHING that anyone can suggest to help, I would be so thankful! I've been loving the nexus, and hate to think that I crippled it
Thanks in advance,
Randy
I doubt its bricked.
Noticed you didnt mention that fast boot doesnt work? (power button+trackball) try it.
Once you get to fastboot you can flash any ROM back. (fastboot flash **** commands from a command shell)
Did you ever perform a Nand Backup from Recovery?
It's not bricked, the only way to brick is to interrupt power when flashing a Radio image
Connect phone to PC. Open command prompt.
adb reboot recovery
Wipe, reflash.
So far, nobody has managed to brick a Nexus. There is no way as the fastboot mode can restore the whole phone and can't be messed with. Make sure you have the latest version of the SDK with correct USB drivers and fastboot. Then try and reflash the recovery image.
-------------------------------------
Sent from my Nexus One
nexus5894 said:
So far, nobody has managed to brick a Nexus. There is no way as the fastboot mode can restore the whole phone and can't be messed with. Make sure you have the latest version of the SDK with correct USB drivers and fastboot. Then try and reflash the recovery image.
-------------------------------------
Sent from my Nexus One
Click to expand...
Click to collapse
Actually...
http://forum.xda-developers.com/showpost.php?p=6320068&postcount=404
Paul22000 said:
Actually...
http://forum.xda-developers.com/showpost.php?p=6320068&postcount=404
Click to expand...
Click to collapse
............................
It worked!!!!!
It worked!!
britoso, thank you soooooo much! The only way that I knew to get into bootloader/recovery was via power button/volume down, but power/trackball brought up the bootloader screen, and I clicked on fastboot. I was able to flash the RA recover image through the command terminal via fastboot, then able to get into recovery. I had cyan and modaco sense on the sd, and was able to flash one of them on.
​
I never thought I'd be so happy to see "quietly brilliant"!!! I WILL buy you a beer, a case in fact as soon as money clears my paypal account.
I have learned my lesson, research research research. (I did do some, but not enough to feel comfortable with what I was doing - hence my cry for help!)
Other than the phone and OS itself, the thing I like most about the nexus is the fact that one CAN root, and then customize (sold a Telus moto droid because I could not do that very thing).
I digress... thanks again so much!
And Paul, thanks for your sense ROM; I've had HTC phones from the Touch to the the diamond to the Hero, and missed the UI!
Randy Malkoski said:
It worked!!
britoso, thank you soooooo much! The only way that I knew to get into bootloader/recovery was via power button/volume down, but power/trackball brought up the bootloader screen, and I clicked on fastboot. I was able to flash the RA recover image through the command terminal via fastboot, then able to get into recovery. I had cyan and modaco sense on the sd, and was able to flash one of them on.
​
I never thought I'd be so happy to see "quietly brilliant"!!! I WILL buy you a beer, a case in fact as soon as money clears my paypal account.
I have learned my lesson, research research research. (I did do some, but not enough to feel comfortable with what I was doing - hence my cry for help!)
Other than the phone and OS itself, the thing I like most about the nexus is the fact that one CAN root, and then customize (sold a Telus moto droid because I could not do that very thing).
I digress... thanks again so much!
And Paul, thanks for your sense ROM; I've had HTC phones from the Touch to the the diamond to the Hero, and missed the UI!
Click to expand...
Click to collapse
Glad to hear it. You learn the most by trial and error.
I think i got the same problem. i tried to Unlock Bootloader and Root Google Nexus One which was successful but then i tried to superboot it and when it came to the part where you "double click the ‘install-superboot-windows.bat’ file" i clicked it but it did not go to the nnext screen where the superboot completes it just stayed at the "bootloader screen". i must hve not done something or done something wrong i dont know.
So then i unplugged the phone from the pc and rebooted it. when it reeboted i wasnt getting any network, the phone was slow and the notification bar would not slide down...also i noticed the phone restarting on itself...
/i tried all kinds of "restore to factory settings" but not solved. Can anyone tell me what to do tht will work. I coud not understand what was said in the above thread as i am new to this android n my first time rooting n stuff n i believe that solution would work for me too..if some one could please explain in simple tirms the steps i need to take would be good...
Really appreciate it....
revonomics said:
I think i got the same problem. i tried to Unlock Bootloader and Root Google Nexus One which was successful but then i tried to superboot it and when it came to the part where you "double click the ‘install-superboot-windows.bat’ file" i clicked it but it did not go to the nnext screen where the superboot completes it just stayed at the "bootloader screen". i must hve not done something or done something wrong i dont know.
So then i unplugged the phone from the pc and rebooted it. when it reeboted i wasnt getting any network, the phone was slow and the notification bar would not slide down...also i noticed the phone restarting on itself...
/i tried all kinds of "restore to factory settings" but not solved. Can anyone tell me what to do tht will work. I coud not understand what was said in the above thread as i am new to this android n my first time rooting n stuff n i believe that solution would work for me too..if some one could please explain in simple tirms the steps i need to take would be good...
Really appreciate it....
Click to expand...
Click to collapse
Tell me what i need to download again and how to go about it...i really need my phone working again ((((

1 Click root brick?!

So i read thru a lot of the root threads & none of them made anh sense to me.I downloaded ADB,moto drivers, sdk,jdk,etc.But still none of it made any sense. So i tried the 1 click root & soft bricked my xoom. It gets stuck at the Motorola screen. I tried getting into the options & wiping user data,factory reset.But it would still get stuck at the dual core screen. So i tried a suggestion of using 1 click root to undo the root. But it said the xoom would say "done" twice on the screen but it only said "done" once. So then i relocked it hoping it would reboot & work but it didn't. I see 1 guy was able to fix his using a rooting guide.I hope someone here can help me out.
Sent from my DROIDX using XDA App
Arun01 said:
So i read thru a lot of the root threads & none of them made anh sense to me.I downloaded ADB,moto drivers, sdk,jdk,etc.But still none of it made any sense. So i tried the 1 click root & soft bricked my xoom. It gets stuck at the Motorola screen. I tried getting into the options & wiping user data,factory reset.But it would still get stuck at the dual core screen. So i tried a suggestion of using 1 click root to undo the root. But it said the xoom would say "done" twice on the screen but it only said "done" once. So then i relocked it hoping it would reboot & work but it didn't. I see 1 guy was able to fix his using a rooting guide.I hope someone here can help me out.
Sent from my DROIDX using XDA App
Click to expand...
Click to collapse
Motorola published the factory files for Xoom awhile back so if you still have fastboot, you can recover from it.
http://developer.motorola.com/produ...utm_source=supportforums&utm_term=unlockboard
I relocked it using the 1 click root and all it says now is "Failed to boot LNX 0x0004" "Starting RSD mode 2".I'm now trying to use the 1 click root to try to get it back to where it was..I just don't understand all of the rooting methods even after downloading adb,sdk,,etc..It may as well be written in Chinese.I'm sure if i saw someone actually do it i could catch on to it but right now rooting is confusing..hence i went with the 1 click.I had no problem 1 click rooting my droid x with a 1 click root.
Stop using one click crap. If you don't know what you're then you should not be messing with your device.
Sent from my DROIDX using XDA App
I can. Just won't.
Arun01 said:
I relocked it using the 1 click root and all it says now is "Failed to boot LNX 0x0004" "Starting RSD mode 2".I'm now trying to use the 1 click root to try to get it back to where it was..I just don't understand all of the rooting methods even after downloading adb,sdk,,etc..It may as well be written in Chinese.I'm sure if i saw someone actually do it i could catch on to it but right now rooting is confusing..hence i went with the 1 click.I had no problem 1 click rooting my droid x with a 1 click root.
Click to expand...
Click to collapse
Type oem unlock again and then flash the stock images...youll be good to go...also there are really good stickies in here that help..pleasedont forget to search before starting a new thread.
albundy2010 said:
I can. Just won't.
Click to expand...
Click to collapse
And this is rude and uncalled for
The OP stated he read quides etc and none of it made sense to him etc. So instead of asking for help a explanation he tries a one click method. Which is stupid. He than softbricks the device and asked for help here.
Then he is told that moto released the factory images and use fastboot if he still has it to recover the device. He then decides to ignore that entirely and go back and try to unroot/restore with the one click BS again. Then he tries to use it again to go back to where he was. Just flat out stupid. He did something when he had no idea wtf he was doing. Was told what to do. Did not do it. He even said it is like Chinese to him.
So I told him to stop messing with one click crap. Which is correct. I told him to stop messing with the ****ing thing. Which is also correct. He needs to learn/understand wtf he is doing. Instead of basically button mashing/trying crap and hoping it will basically fix itself.
On top of that this posted in the wrong section. Uncalled for my ass. He is the one that was rude when told to not mess with the one click or the device. Now this part is rude. **** his stupid ass.
csseale said:
Type oem unlock again and then flash the stock images...youll be good to go...also there are really good stickies in here that help..pleasedont forget to search before starting a new thread.
Click to expand...
Click to collapse
How do i get to that ..and where do i type it at ..i looked in device manager & does recognize the xoom..it says "Motorola USB Device:Motorola Flash Interface"..In properties under "Driver" it has options for driver details..update driver..disable & uninstall.Can i do anything with them?
I tried opening SDK manager but it never lets me type anything in the box as it's always trying to do some kind of update in another window so when i close the window it closes all of the windows.
Sent from my DROIDX using XDA App
Arun01 said:
So i read thru a lot of the root threads & none of them made anh sense to me.I downloaded ADB,moto drivers, sdk,jdk,etc.But still none of it made any sense. So i tried the 1 click root & soft bricked my xoom. It gets stuck at the Motorola screen. I tried getting into the options & wiping user data,factory reset.But it would still get stuck at the dual core screen. So i tried a suggestion of using 1 click root to undo the root. But it said the xoom would say "done" twice on the screen but it only said "done" once. So then i relocked it hoping it would reboot & work but it didn't. I see 1 guy was able to fix his using a rooting guide.I hope someone here can help me out.
Sent from my DROIDX using XDA App
Click to expand...
Click to collapse
If they didnt make sense to you in the first place you probably shoud not be attempting to root... U went straight to an old method that even the developer has marked in hs thread can full brick you and should not be used. The xoom costs like 600 bucks... Why wouldnt you do extensive research on how to root? If you did not understand the terms why didn't you research the methods and learn it?
I hope you can flash the factory imagines back through fastboot and adb, but i just do not understand why people attempt this stuff when they have no idea what the terms even mean...
You need to have sdk, hook up to usb on your computer, and follow one of the unlock guides posted on this site... A real one using adb... Then you need to follow a root one...
Sorry that is not more helpful, but half of this experience is that you need to learn what you are doing and the instructions are out there. If they do not make sense at this point im afraid you are stuck. Now the way your device is you have to figure it out...
Arun01 said:
I relocked it using the 1 click root and all it says now is "Failed to boot LNX 0x0004" "Starting RSD mode 2".I'm now trying to use the 1 click root to try to get it back to where it was..I just don't understand all of the rooting methods even after downloading adb,sdk,,etc..It may as well be written in Chinese.I'm sure if i saw someone actually do it i could catch on to it but right now rooting is confusing..hence i went with the 1 click.I had no problem 1 click rooting my droid x with a 1 click root.
Click to expand...
Click to collapse
Please check out this thread.It is called Root heaven for a reason. Just about every viable rooting guide, all the files and explanations you will need are here.
http://forum.xda-developers.com/showthread.php?t=1209341
I urge you to just calm down, read about what is the sdk, what is adb, how to recover from a soft brick and so on. The xda xoom forum is all about learning and teaching. We were all noobies once. The Xoom is a very complex device with many models and vesions and one clicks just don't cut it. There are rooting methods that are relatively simple but you really need to be prepared before you get started.
Good luck and don't despair. You'll get there.
Thanks for the help guys.I'm reading through all of the threads and i see a typo in a post that in the command window would've never let me find the sdk tools on my c drive. But after i retyped it i did it & a bunch of writing came up. Trying to figure out now how to flash the stock images to the xoom.
Sent from my DROIDX using XDA App
Arun01 said:
Thanks for the help guys.I'm reading through all of the threads and i see a typo in a post that in the command window would've never let me find the sdk tools on my c drive. But after i retyped it i did it & a bunch of writing came up. Trying to figure out now how to flash the stock images to the xoom.
Sent from my DROIDX using XDA App
Click to expand...
Click to collapse
at first, make sure you install android sdk correctly. then go to android sdk-folder in your computer, u will find a folder named platform-tool. Press shift+ right click on it, then choose open command window here. After that, type in "adb devices" or "fastboot devives" to check if your xoom is connected. If yes,you good to go. If no, check your android sdk installed process
After i type in abd devices it says list of devices attached but shows nothing..i did copy the sdk tools folder to the c drive like i was told.
@OP
If you can't do it yourself, getting somebody to help you (in person) is always an option. If you live in a major city, advertise on Craigslist or some equivalent. Offer $50 for debricking + some tutorial.
In order for the device to show up in adb the device needs to actually booted into the os and have USB debugging enabled. Which you can't do.
What you're supposed to do is use fastboot.
Boot the device into fastboot mode.
Use fastboot devices to see if the computer see's it/everything is set up etc.
If bootloader is locked unlock it with fastboot OEM unlock.
Then flash the official images for your exact device. Fastboot flash boot boot.img and so on.
The last command on restoring to stock guides is optional. Fastboot OEM lock. I would not do it. No reason to relock it. If do learn decide to root later you would have to unlock again and loose all data.
albundy2010 said:
In order for the device to show up in adb the device needs to actually booted into the os and have USB debugging enabled. Which you can't do.
What you're supposed to do is use fastboot.
Boot the device into fastboot mode.
Use fastboot devices to see if the computer see's it/everything is set up etc.
If bootloader is locked unlock it with fastboot OEM unlock.
Then flash the official images for your exact device. Fastboot flash boot boot.img and so on.
The last command on restoring to stock guides is optional. Fastboot OEM lock. I would not do it. No reason to relock it. If do learn decide to root later you would have to unlock again and loose all data.
Click to expand...
Click to collapse
That's good advice...no reason to re-lock. But get back to square one so that you're functional and then when you're ready to try again, do it the right way.
Again, good luck!
albundy2010 said:
In order for the device to show up in adb the device needs to actually booted into the os and have USB debugging enabled. Which you can't do.
What you're supposed to do is use fastboot.
Boot the device into fastboot mode.
Use fastboot devices to see if the computer see's it/everything is set up etc.
If bootloader is locked unlock it with fastboot OEM unlock.
Then flash the official images for your exact device. Fastboot flash boot boot.img and so on.
The last command on restoring to stock guides is optional. Fastboot OEM lock. I would not do it. No reason to relock it. If do learn decide to root later you would have to unlock again and loose all data.
Click to expand...
Click to collapse
Thanks a lot.I was able to unlock it then it rebooted & stopped at the Motorola screen then i started the 1st command: fastboot flash boot boot.img & it says waiting on device..but nothing happens so far.Should i move on to the next step or retry?

[Q] Need help installing android 4.4

Hi all, I've messed up with my nexus 7 2013 and i think its soft bricking.
I was using multirom and accidentally installed the wrong kernel. Every time I boot into android (4.4) it loads slow and then instead of displaying the screen it shows two duplicated top left hand corners and remains unresponsive.
Unfortunately i never got the chance to enable usb debugging and my bootloader is locked.
I tried a few things suggested online but they didn't work and multiform appears to have been wiped.
Recovery still works (TWRP) but I'm really in a bind.
Any help on getting back to stock android 4.4 would be amazing, but please bear in mind I'm new to android, so please provide detailed instructions.
Probably your best way would be using fastboot, can't give you details but I have seen it on here. Google fastboot nexus 7.
Sent from my Nexus 10 using XDA Free mobile app
gandy92 said:
Hi all, I've messed up with my nexus 7 2013 and i think its soft bricking.
I was using multirom and accidentally installed the wrong kernel. Every time I boot into android (4.4) it loads slow and then instead of displaying the screen it shows two duplicated top left hand corners and remains unresponsive.
Unfortunately i never got the chance to enable usb debugging and my bootloader is locked.
I tried a few things suggested online but they didn't work and multiform appears to have been wiped.
Recovery still works (TWRP) but I'm really in a bind.
Any help on getting back to stock android 4.4 would be amazing, but please bear in mind I'm new to android, so please provide detailed instructions.
Click to expand...
Click to collapse
Wugfresh toolkit should also work, especially if you are not familiar with or interested in learning fastboot & adb.
wtherrell said:
Wugfresh toolkit should also work, especially if you are not familiar with or interested in learning fastboot & adb.
Click to expand...
Click to collapse
I used the Wugfresh tookkit and it worked like a charm!
Thank you both for getting back to me and helping me fix this. I really appreciate it!

Nexus 6P stuck on google screen - bootloop (bootloader locked)

Hello all,
Anybody can help me, my problem is that my nexus 6p stuck on google screen (boot-loop), noting that unfortunately the boot-loader is locked . I've tried different solutions but non of the worked.
What to do please???
GlorySy said:
Hello all,
Anybody can help me, my problem is that my nexus 6p stuck on google screen (boot-loop), noting that unfortunately the boot-loader is locked . I've tried different solutions but non of the worked.
What to do please???
Click to expand...
Click to collapse
Install Wugfresh or any other toolkit of your choice to your PC, install drivers, install stock rom, follow onscreen instructions, done.
superviked said:
Install Wugfresh or any other toolkit of your choice to your PC, install drivers, install stock rom, follow onscreen instructions, done.
Click to expand...
Click to collapse
This won't work. The bootloader is locked and he has no way to unlock it.
GlorySy said:
Hello all,
Anybody can help me, my problem is that my nexus 6p stuck on google screen (boot-loop), noting that unfortunately the boot-loader is locked . I've tried different solutions but non of the worked.
What to do please???
Click to expand...
Click to collapse
Can you get into the stock recovery?
@GlorySy, you seem on the same issue as this. Please have a look and confirm it is what we got to worry. http://forum.xda-developers.com/nexus-6p/help/main-board-failure-story-t3409400
Not applicable
superviked said:
Install Wugfresh or any other toolkit of your choice to your PC, install drivers, install stock rom, follow onscreen instructions, done.
Click to expand...
Click to collapse
I cannot install any thing with locked boot loader :crying:
Yes
Heisenberg said:
Can you get into the stock recovery?
Click to expand...
Click to collapse
Yes I can, but can do nothing except for turn off the device. :crying:
GlorySy said:
Yes I can, but can do nothing except for turn off the device. :crying:
Click to expand...
Click to collapse
Go to my guide:
http://forum.xda-developers.com/nexus-6p/general/guides-how-to-guides-beginners-t3206928
Follow the instructions in section 13 to adb sideload one of the full OTA zips.
Heisenberg said:
Go to my guide:
http://forum.xda-developers.com/nexus-6p/general/guides-how-to-guides-beginners-t3206928
Follow the instructions in section 13 to adb sideload one of the full OTA zips.
Click to expand...
Click to collapse
I just started having this same issue.
I can't get into recovery from the bootloader in order to perform section 13. Once hit recovery, it's back to looping boot screen with white Google text.
Just got finished with Google phone support. They're sending me a new device. It must be a hardware failure.
Background: I got OTA notification on Friday night. I downloaded and hit install. Then after a while it said there was an upgrade error, and to please try again. But it was going to have to download the 1+ GB OTA file again, so I just said screw it, i'll do it later. Here am I 2 days later with a broken phone. Thinking this has to be related.
Stock phone, locked bootloader. Running 6.0.1
GlorySy said:
Hello all,
Anybody can help me, my problem is that my nexus 6p stuck on google screen (boot-loop), noting that unfortunately the boot-loader is locked . I've tried different solutions but non of the worked.
What to do please???
Click to expand...
Click to collapse
busbeepbeep said:
I just started having this same issue.
I can't get into recovery from the bootloader in order to perform section 13. Once hit recovery, it's back to looping boot screen with white Google text.
Click to expand...
Click to collapse
Please join this thread to help troubleshoot.
I am hoping to collect enough data to figure out a solution for all effected.
is your BL locked and device encrypted?
When you try to load recovery, does it ask for password?
try entering your last google account email password if so.
Help!! Stuck in Google screen
Heisenberg said:
Go to my guide:
http://forum.xda-developers.com/nexus-6p/general/guides-how-to-guides-beginners-t3206928
Follow the instructions in section 13 to adb sideload one of the full OTA zips.
Click to expand...
Click to collapse
Hi Heisenberg,
I ran into this problem today with my phone stuck on Google screen. I tried to use your guide and put my phone in recovery but it just goes back to rebooting and just shows the "Google" logo so if I can't get the phone into recovery then I won't be able to use your guide right? Is these any other way to solve this problem or am I screwed?
Also how can this problem be prevented in the future if I got new phone under warranty? Do I root and flash pure Nexus ROM and backup images?
Thanks,
Azeem00 said:
Hi Heisenberg,
I ran into this problem today with my phone stuck on Google screen. I tried to use your guide and put my phone in recovery but it just goes back to rebooting and just shows the "Google" logo so if I can't get the phone into recovery then I won't be able to use your guide right? Is these any other way to solve this problem or am I screwed?
Also how can this problem be prevented in the future if I got new phone under warranty? Do I root and flash pure Nexus ROM and backup images?
Thanks,
Click to expand...
Click to collapse
Hello... Try to look here:
https://forum.xda-developers.com/nexus-6p/help/boot-loop-death-nexus-6p-t3533528
For your second question, it's hard to tell... Making regular backups may help protecting your datas, but can't help your new phone to start acting crazy...
I have been doing weekly backups to my pc. I backup my TWRP, TBU, Super Backup, DCIM and download directories.
Sent from my Nexus 6P using XDA-Developers Legacy app
Heisenberg said:
Go to my guide:
http://forum.xda-developers.com/nexus-6p/general/guides-how-to-guides-beginners-t3206928
Follow the instructions in section 13 to adb sideload one of the full OTA zips.
Click to expand...
Click to collapse
Any ideas are any solution when I have custom rom?
EDIT: Not needed, seems that wife phone has motherboard problem because now it will stuck in TWRP screen.
I am pretty sure I had this problem before. Actually within hours of purchasing and rooting. Lol go into fastboot and install factory images. If you were able to get into recovery you could use adb to oem unlock.. but that doesn't sound like an option.
My phone died last night in a bootloop death. Thankfully here in the UK we have a 2 year warranty so Huawei are taking it back. I mentioned "bootloop issue" and the tech guy stopped asking the standard stuff and just sent me a returns bag.
Try this:
https://forum.xda-developers.com/nexus-6p/general/confirmed-hardware-defects-nexus-6p-t3610405
Quickly enable bootloader unlocking, then follow the tutorials already known for 4-core recovery
Well I've now got a different phone back from Huawei as they told me they no longer have replacement motherboards available.
Sent from my MHA-L29 using Tapatalk

Nexus 6P will not boot when boot loader is locked!

After using the megapixel rom. I tried flash back to stock with root tool kit.
During the process it told me I had to manual boot in recovery to a factory restore. That would not work so I ended up soft bricking my phone. I was able to side load twrp and the latest build and flash it (thank god). No when I do oem lock boot loader, my nexus 6p won't boot. As soon as I oem unlock, it will boot. Any ideas what could be cause that?
If you did not restore the recovery it probably throws a flag and says the configuration is invalid. You need to restore completely (recovery, boot, system, vendor, etc) through fastboot so that it is truly stock.
Cheers,
B.D.
This is a perfect time to remind folks that "locking" the bootloader is something that should be done with great care. There are dozens, if not hundreds of "my phone is bricked" threads centered around locking their bootloader without understanding the requirements and risks. If you don't have a reason to do it, leave it unlocked. If I need to do it, I flash 100% back to stock using a full factory image before locking.
Sent from my Nexus 6 using XDA-Developers Legacy app
BostonDan said:
If you did not restore the recovery it probably throws a flag and says the configuration is invalid. You need to restore completely (recovery, boot, system, vendor, etc) through fastboot so that it is truly stock.
Cheers,
B.D.
Click to expand...
Click to collapse
So you wouldn't recommend using the Nexus toolkit to flash factory? Can you give me the string in order that I would use to flash factory via fastboot? Fast boot is also hit or miss with the commands for me.
Blackfish77 said:
So you wouldn't recommend using the Nexus toolkit to flash factory? Can you give me the string in order that I would use to flash factory via fastboot? Fast boot is also hit or miss with the commands for me.
Click to expand...
Click to collapse
No offense intended, but this always irks me quite a bit.
Absolutely DO NOT use toolkits for anything at all, ever. They're not easier, they're not faster. It's just doing fastboot / adb with a UI that has buttons you can click instead of typing in fastboot.
This. This is the exact reason you shouldn't use toolkits. Especially if you don't know the manual way. It borks something up and now you need to wait possibly hours to get a working phone again when the solution would only take about 15 seconds to fix.
You need to fully familiarize yourself with this guide here;
https://forum.xda-developers.com/nexus-6p/general/guides-how-to-guides-beginners-t3206928
ADB/Fastboot is absolutely not "hit or miss." If you have trouble with it then you need to make sure that your drivers are properly installed and you're entering commands correctly. Also make sure to ALWAYS keep your ADB & fastboot drivers up to date via the Android SDK. All of this is covered in the link above.
As far as your bootloader issue. You cannot return to a locked bootloader with anything other than 100% complete unadulterated stock factory images. No TWRP, no root, no Xposed, no Magisk, no build.prop edits etc., ...Nothing.
Use fastboot to flash your factory images you downloaded. You can use the flash all bat file or individually flash each separate. Again it's all covered in the link I posted above.
Also, what do you mean you couldn't wipe/reset from stock recovery? When you flash stock recovery and boot to it, you will see an Android on its back with an exclamation mark in a red triangle. You may or may not see text that reads "No Command". Either way, from that point hold down the power button and then press and release volume up. You will boot to stock recovery where you can wipe your data.
Not for nothing, but as mentioned above, people have hard bricked their 6P from locking bootloader's on combos besides stock. You got extremely lucky you didn't as well. Please take some time to read and fully understand what you're doing with your ~600$ device.
This is also, for the most part, pretty standard stuff as far as flashing / modding goes. At least since 2010 when I got into it. If you want to know the exact string of fastboot commands please read and use the guide I linked. It teaches you literally everything. There's nothing it doesn't cover and once you get used to it you will never use a toolkit again.
Hope I didn't come off rude, but basically since 2010 when I got into this across all my devices I try to help out in the Q+A sections. I've probably participated in hundreds and hundreds of "help, I used a toolkit and my phone is bricked and I have no idea how to fix it, I just wanted cool stuff on my phone" threads. They're absolutely 100% not worth the trouble and headaches from them. Especially if you have no idea what they're doing on the back end. Know Fastboot and ADB like the back of your hand and just prefer to use them? That's a different story, if something fails then you fix it yourself in 10 seconds. But for the love of God, please please please please please stop using toolkits if you don't know how to fix issues on your own. You will eventually hard brick. I've seen it happen dozens of times. Thread turns into a circlej*rk about whether toolkits are bad or not, OP hard bricks their phone and commits fraud, which is illegal by trying to RMA it. Just don't use them. It's simple enough without them. Why reinvent the wheel when it works just fine?
You should only lock bootloader when you are on stock factory image from nexus developers site. Either use flash_all script or flash everything manually. As others said keep away from toolkits.. You never know what can go wrong or what they re doing in background.
As I understand you restored TWRP and Megapixel rom and tried to lock the bootloader when you had that combination installed on your phone? That can not be done. You are either full stock (rom, kernel, recovery...) and locked bootloader or unlocked bootloader and any combo of kernel, rom, recovery that you want.
RoyJ said:
No offense intended, but this always irks me quite a bit.
Absolutely DO NOT use toolkits for anything at all, ever. They're not easier, they're not faster. It's just doing fastboot / adb with a UI that has buttons you can click instead of typing in fastboot.
This. This is the exact reason you shouldn't use toolkits. Especially if you don't know the manual way. It borks something up and now you need to wait possibly hours to get a working phone again when the solution would only take about 15 seconds to fix.
You need to fully familiarize yourself with this guide here;
https://forum.xda-developers.com/nexus-6p/general/guides-how-to-guides-beginners-t3206928
ADB/Fastboot is absolutely not "hit or miss." If you have trouble with it then you need to make sure that your drivers are properly installed and you're entering commands correctly. Also make sure to ALWAYS keep your ADB & fastboot drivers up to date via the Android SDK. All of this is covered in the link above.
As far as your bootloader issue. You cannot return to a locked bootloader with anything other than 100% complete unadulterated stock factory images. No TWRP, no root, no Xposed, no Magisk, no build.prop edits etc., ...Nothing.
Use fastboot to flash your factory images you downloaded. You can use the flash all bat file or individually flash each separate. Again it's all covered in the link I posted above.
Also, what do you mean you couldn't wipe/reset from stock recovery? When you flash stock recovery and boot to it, you will see an Android on its back with an exclamation mark in a red triangle. You may or may not see text that reads "No Command". Either way, from that point hold down the power button and then press and release volume up. You will boot to stock recovery where you can wipe your data.
Not for nothing, but as mentioned above, people have hard bricked their 6P from locking bootloader's on combos besides stock. You got extremely lucky you didn't as well. Please take some time to read and fully understand what you're doing with your ~600$ device.
This is also, for the most part, pretty standard stuff as far as flashing / modding goes. At least since 2010 when I got into it. If you want to know the exact string of fastboot commands please read and use the guide I linked. It teaches you literally everything. There's nothing it doesn't cover and once you get used to it you will never use a toolkit again.
Hope I didn't come off rude, but basically since 2010 when I got into this across all my devices I try to help out in the Q+A sections. I've probably participated in hundreds and hundreds of "help, I used a toolkit and my phone is bricked and I have no idea how to fix it, I just wanted cool stuff on my phone" threads. They're absolutely 100% not worth the trouble and headaches from them. Especially if you have no idea what they're doing on the back end. Know Fastboot and ADB like the back of your hand and just prefer to use them? That's a different story, if something fails then you fix it yourself in 10 seconds. But for the love of God, please please please please please stop using toolkits if you don't know how to fix issues on your own. You will eventually hard brick. I've seen it happen dozens of times. Thread turns into a circlej*rk about whether toolkits are bad or not, OP hard bricks their phone and commits fraud, which is illegal by trying to RMA it. Just don't use them. It's simple enough without them. Why reinvent the wheel when it works just fine?
Click to expand...
Click to collapse
I ended up using fastboot to flash factory. I then re locked bootloader and everything booted without and issue. I was happy about that. I re rooted and everything is working great. :good:
I can say I learned a lot from this experience. Thanks to everyone for your advice. I am now comfortable using the fastboot method. Almost bricking my phone was scary but it taught me a lesson. Cheers everyone.

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