[cm1]

It would freeze at the boot screen where it says "Pocketbook", a hard reset (holding down the power button for 10 seconds) would reset it, but it would still start up again and freeze again at the same boot screen.

I was able to unfreeze it at that screen by holding down the < and > keys for two seconds to force quit whatever was frozen. I did this a few times and it eventually got to the main screen, but the interface language was wrong.

I figured something was wrong with the firmware, so I downgraded back to 6.1.900, and it's working fine so far.