I recently was running Cyanogenmod 10.1.3 (i think... it was the latest stable build) when I got a notification to update to 10.2.1. I did so through the cyanogen updater and it seemed to work fine but the phone would randomly reboot. Finally it did so but remained at the initial loading screen. I then booted into TWRP and flashed the 10.2.1 again. Same deal it just wouldn't boot it remained frozen. I then tried to reflash 10.1.3, the previous version I was running. The phone imediatley booted into fastboot with a flash failure indicator despite TWRP saying it had been sucessful. I have since tried to install the Mototola's OEM firmware, as well as do a restore from a backup I had made in TWRP. nothing works and I can't move past fastboot. Im interested to know why this is happening and how I can reflash properly without getting an error? Any replies will help. Thanks.