Then I was trying to make a stock backup in TMRP. After an hour now, it is still trying to backup SYSTEM. I did enable compression, but it shouldn't take this long... TMRP is responsive, I can lock and unlock the screen.
How can I force reboot the phone? ADB says "device not found", and long press power bottom does nothing. I also tried power+vol up, power+vol down, and all three, nothing reboots the phone.