reboot after booting a few minute

[thanhcuong dao]

Hi everyone,
I have a nexus 7 2012 wifi, it boots well then three or for minutes after that it auto reboots and the loop of boot and reboot happens forever. I have tried :
- setting data to factory reset : fail, maybe no enough time.
- Use Recovery to wipe data : the proccess complete but nothing was wipe.
- Use NRT 2.1. to root device : but fails at step UNLOCK.
Please helps me to fix my nexus 7.
thank so much,
thanhcuong.

 

[lunatic59]

In NRT here is a bootloop option on the right. Have you tried that?

 

[thanhcuong dao]

In NRT here is a bootloop option on the right. Have you tried that?

yes, I tried. When I choose soft-Bricked/Bootloop option, the process also go to Unlock step and fails in this step. Now the main problem is that can't unlock.
Some more information about my device:
- on fastboot mode for long time interval

 

[James L]

Jtag if it'll work. Otherwise it's done for.

 

[thanhcuong dao]

yes, I tried. When I choose soft-Bricked/Bootloop option, the process also go to Unlock step and fails in this step. Now the main problem is that can't unlock.
Some more information about my device:
- on fastboot mode for a long time interval the device doesn't run in bootloop any more.
- text screen in fastboot mode:
FASTBOOT MODE
PRODUCT NAME -- grouper
VARIANT -- grooper
HW VERSION -- ER3
BOOTLOADER VERSION -- 4.23
BASEBAND VERSION -- N/A
SERIAL NUMBER -- 015d4....
SIGNING -- not defined yet
LOCK STATE -- LOCKED

 

[thanhcuong dao]

Jtag if it'll work. Otherwise it's done for.

Hi Jame,
I don't understand your post, maybe it so short.
please explain more detail.
thanks so much.

 

[James L]

It's non repairable by normal methods, unless you're having issues with fastboot drivers.

 

[lunatic59]

You might try a different cable and a different USB port. It's one of those things that shouldn't matter but often does.