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[Q] Nexus 7 stuck at google screen

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By jreader, Junior Member on 15th March 2014, 02:32 PM
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Ok, my Nexus 7 is stuck - not getting passed from Google boot screen.

Here is a bit of history..

I unlocked and installed Cyanogen 10.1 awhile back, and TWRP recovery. It's actually dual rom - I can't remember the name of the other ROM.

I haven't used it for a few months and today I charged the battery and used it. It was all good until I checked for update and found that there is Cyanogen 10.2.1. So I clicked download and install.

It downloaded, then rebooted. And when the system is up, I got the pop up saying Google Service is stopped unexpectedly. Some app icons I got on my home screen are still there, but there is no menu bar. There is no home button, no app drawer. So I rebooted, and the same google service error.

So I thought, maybe it's not compatible with 10.2. I rebooted into recovery mode and install 10.1 (the old rom zip file was still on the device) using TWRP. Only took a few seconds and then it says successful/done. To make sure, I also did wipe dalvik cache, then reboot.

Now the system only goes as far as Cyanogen loading screen. That's it. So I hold the power button for a few seconds, then when the device restart, pressed the volumn down button. Then I chose 'reboot recovery'.

It doesn't. It just hangs at Google screen. I tried a few times, the same. So trying to reboot into recovery hangs at google screen, and trying to reboot normally hangs at Cyanogen screen.

As a last attempt, I let the screen hangs on Cyanogen log, connected the device to my Mac, then tried "fastboot devices". Nothing.. empty.
But when I tried "adb devices", I get an entry something like this

List of devices attached 
015d2bcxxxxxx	unauthorized
./adb shell
error: device unauthorized. Please check the confirmation dialog on your device.
What should I do to get my tablet working again? I dont mind losing all data - I just want it working again. Someone please advice me..
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