I own a Nexus 7 tablet (the first Wi-Fi + 3G model - only front-facing camera, no support for phone calls). Yesterday, I wanted to take a screenshot on my tablet and tried various key combinations; i.e. power key + up/down volume keys; I am not sure about the exact combination, especially because I didn't expect anything bad to happen.
I am not sure that's the exact cause, but there's no other way it'd have gotten into safe mode.
So, how do I get my tablet out of safe mode?
...restart your device to get it out of safe mode
Following these exact steps, I tried manually booting into safe mode, and then restarting the tablet to get out of it.
It is necessary to hold the volume control switch to "high" and then operate the "on" switch, to get out of safe mode [...] hold the "on" switch for at least fifteen seconds.
Reset device to factory settings.
Reset device in Recovery mode.
(Followed steps under Nexus 7 section) successfully from 1 to 5. Volume buttons become unfunctional at this point, and I am unable to use them to scroll to "wipe data/factory reset". Mind you, the volume buttons worked in the first few steps, so there's nothing wrong with the buttons themselves.
Battery pull, i.e. holding the power button until the tablet restarts.
Remove SIM card and restart. Insert SIM and restart.
But... NONE of them worked. My tablet is still in safe mode and I'm out of ideas. Is there anything I can do to fix this?