got the same thing as him but i found the problem, i reflash the firmware and then after that i reflash the firmware and emmc to make sure i can reproduce the problem so here it goes... when i install cssu its no problem at all and this is not the first time i install this the only problem is the last update 12.1 the one before that work just fine for me, so heres the culprit when i turn on forced auto rotation = 1 it will get stuck into a reboot loop... to explain this carefully it will turn on and load your desktops blinks like 4x but all shortcuts and widgets are messed up on 1 window the only way to stop it dying from reboot loop is if i put it on usb mass storage but when you do that you cant tap anything and freezes.