So I used the DU updater to update to 1.2. The install loops at "Dirty Unicorn is Starting... - Preparing Settings."
I tried to reboot and the same thing happened. So then I went to revert to an older backup of the initial 6.0 DU image. And my pin no longer works... I never had another pin, so this is not a case of me forgetting it. Before I reverted to the initial 6.0 DU release the tablet would keep turning itself on, even if I shut it down, the tablet would power on within 12 seconds, over and over. So my Nexus 9 is pretty much useless right now, definitely going to lose my data.
Any clues what happened? I mean, I used the official updater, did not expect this to happen. Peeved and confused.