I also had a F90 BT constantly rebooting. It didn't go beyond the splash screen, but lets say 1 out of every 20-30 reboots, all of the sudden it will boot completely and it will be completely functional. BUT, once I started driving beyond the 10 mph limit, there appeared a warning saying that my parking brake was improperly installed (i had the hardware bypass installed). No matter what I did next (pressing ok, or ignoring the warning) the unit ended up rebooting again, and the cycle started over. I tried everything, I undid the hardware bypass, i did the sftware bypass, checked for proper g