[Q] Nexus 7 2012 reboots

My Nexus 7 16GB 2012 has started to randomly reboot, it's running 4.4.2 and has been fine for months. This morning I switched it in, turned off the Airplane Mode and after 30 seconds or so it locked up, then reset. This happens every time I turn off Airplane Mode and switch on WiFi.

I'm wondering if there is some sort of corrupt RAM causing the issue? I've tried to do a Factory Reset, but this also fails and I end up back at square one. So I tried Nexus Root Tookit to go back to stock (all I've done previously is unlock the bootloader, no root). This also fails:

sending 'bootloader' (3911 KB)...
OKAY [ 0.516s]
writing 'bootloader'...
FAILED (remote: (InvalidState))
finished. total time: 0.745s

Any suggestions on what to try next?

This may of course be a hardware fault, the device was bought in Summer 2012 on release.

estape11 said:

Hi, you need download image of 4.4 and flash it, because 4.4.2 image has corrupt bootloader. If not work try 4.2.2 image and update to kitkat OTA

Cheers, E11

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Thanks for the tip, I'll give that a try.

I have been able to use the Nexus Toolkit to temporarily flash the TWRP. I test my hypothesis about an invalid file system and that fails:

/data/media/0/TWRP errno=30

Anyway, it's downloading the image now so lets see if that fixes the problem.

nigelw said:

Thanks for the tip, I'll give that a try.

I have been able to use the Nexus Toolkit to temporarily flash the TWRP. I test my hypothesis about an invalid file system and that fails:

/data/media/0/TWRP errno=30

Anyway, it's downloading the image now so lets see if that fixes the problem.

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Click to collapse

I'm trying KRT16S and the "Back to Stock" option. The Nexus goes to bootloader mode (so I have Android on back with open door). The flashstock.bat runs in a command tool and displays no errors, but nothing appears on the Nexus 7? The script completes, Nexus reboots and is in exactly the same state.

It doesn't seem to want to accept any kind of update.

lagoskon said:

Give a try with twrp 2.6.3.0.
Latest has issues with backups

Στάλθηκε από το Nexus 7 μου χρησιμοποιώντας Tapatalk 2

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From TWRP I'm able to Wipe and do Factory Reset. It says successful, but when I restart nothing has changed, still got 4.4.2 installed.

I also tried Back to stock with 4.2.2 JDQ39, device goes to Bootloader mode but fails with this error:

sending 'bootloader' (2096 KB)...
OKAY [ 0.287s]
writing 'bootloader'...
FAILED (remote: ()
finished. total time: 0.873s
rebooting into bootloader...
FAILED (command write failed (Unknown error))
finished. total time: 0.637s

archive does not contain 'boot.sig'
archive does not contain 'recovery.sig'
archive does not contain 'system.sig'
--------------------------------------------
getvar:version-bootloader FAILED (command write failed (No such device or address))
finished. total time: 0.000s