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[Q] Nexus 7 2012 Wont boot after update

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Posts: 19
Join Date: Nov 2010
Default [Q] Nexus 7 2012 Wont boot after update

I have been working with Android for a few years now. My Nexus 7 has no problems. A friend tried to update her 7 to 4.4.4 via the standard system update. Hers was completely stock, not rooted, not unlocked. She ended up stuck in the bootloader afterward.

The bootloader is locked. When I try to unlock it I get the following error.
(bootloader) erasing userdata...
(bootloader) erasing userdata done
(bootloader) erasing cache...
(bootloader) erasing cache done
(bootloader) unlocking...
FAILED (remote: (unknown error code))
finished. total time: 5.299s.

I have tried 2 computers, 3 usb cables. I have tried WUGS toolkit as well without luck. Nothing seems to get this bootloader unlocked.
Is there anyway to flash the factory files with a locked bootloader?
Any other options?
Erovia's Avatar
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@gotbeer: Have you tried unlocking it with fastboot?
Phone: Nexus 4
ROM: ParanoidAndroid 4+
Kernel: hells-Core
Recovery: MultiROM
Tablet: Nexus 7
ROM: SlimKat 5+
Kernel: LeanKernel
Recovery: MultiROM
Phone: Motorola Milestone A853 ROM: CyanogenMod 9.1.0d Recovery: Open Recovery MiniMod by -FuFu-
Junior Member - OP
Thanks Meter 0
Posts: 19
Join Date: Nov 2010
Sadly the string above is what I get when I used fastboot to unlock.

fastboot oem unlock

I have completely drained the battery and am going to try again. Three other Nexus 7's and a Galaxy Nexus and Ive never had a problem with unlocking the bootloader. Im beginning to suspect a hardware failure on this one.

Is there another way besides fastboot to unlock the bootloader I can try? The system partition is erased so I cant get into there to do anything. Im sure she never enabled USB debugging, so ADB is out of the question?
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