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Have you tried a hard reset?
Shut down the TF and unplug.
Hold VOL- and LOCK/PWR for 10-12 seconds until text appears in the top left corner. Release. Next screen should have 2 icons, and the right one should have a green haze fading in and out. Wait about 10 seconds and it will say Cold Booting Linux and it will boot up.
This will not erase any data on the device.