Nexus 9 boot failure - Security patch July 2016 SOLVED
The Android Marshmallow security update for July 2016 caused boot failure of my Nexus 9 tablet. The error message is shown in the picture on the right:
"Your device is corrupt. It can't be trusted and may not work properly"
View Video ½ min
After a while it reboots and ends up with the picture shown below: