nexus loop back issue explained
DESCRIPTION
Nexus tablet has issues quite often found when it hangs or does not restart. It stucks to initial screens with Google logo. This book explains the issues related to it.TRANSCRIPT
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I have a problem with my nearly new Nexus 7 2013 Wifi model.
First the story hat happened, maybe it has to do with it:
I bought it in August and now updated it to the last version, 4.4.2
Kitkat.
All was fine, i never had any problems until 2 days ago. I saw that the
battery was running out but since it was night i let it be. In the
morning i heard the sound for an empty battery for the last time, but i
didnt check screen. After 20 minutes i looked at the screen and saw the
Google-letters only. It didnt respond to the Power button beeing pressed
so i thought the battery is too empty to let the device start and decided
to plug it to the charger.
Just now i saw that the cable was not plugged in the charger, it was
plugged in the PC instead, connected to an USB port (of course). As soon
as i saw it i plugged out the cable from PC-USB and put it into the
charger. Im afraid this wasnt good. Not sure what happened here exactly.
Now the problem
Anyway, nothing happened after plugging into charger, the Google letters
where there but no symbol that the battery is loaded or anything. I
thought ok, maybe thats normal if battery fully dry so i let it charge
for at least 3 hours. I saw a symbol now and it showed the battery 80%
full. Now i tried to start the device but nothing at all happened. Still
the Google letters showed up and not more. I know about the fastboot menu
(power+volume down) and did that. The fastbook menu shows up and i can
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select all kind of things like "Start", "Restart bootloader", "Recovery"
and "Shut off". Following things happen when i press them:
1. Start > 1 second after pressing start the Google letters show up and
nothing happens anymore, no X, nothing
2. Restart bootloader > bootloader restarts (works also over tools like
Nexus 7 Root Toolkit, i can restart here too)
3. Recovery > same as 1., the Google letters show up, not more.
4. Shut off > Device shuts off
Now im also developing for Android and that means i have SDK and drivers
and all that iinstalled. And it worked always, i could push an app to the
device over ADP etc. That just as a side note.
So now i tried to unlock the bootloader to flash my own one, with
fastboot. When i enter "fastboot oem unlock" it is stuck right at the
first point, wipe userdata. The device has an id so the drivers are ok i
think. I just cannot erase the userdata. This will stay like this until i
power of the device. Then it continues and says "failed".
The real question
Now without to be able to continue past this im not able to flash
anything, if im correct yes.? So do you think this is a hardbrick? Are
there other options?
Thanks for any help and tipps, im really out of options.
Btw, exactly same behaviour i have with tools like Nexus Root Toolkit or
any, fastbook cannot erase user-data on bootloader and stuck