lets say i downgrade my ta082, and use 3.40-OE for now, but later on decided to go back to sony's official 3.5 firmware or whatever is out. ive read that alot of people have had problems going back to official firmware after using cfw. so how would i go about taking precautionary measures to avoid this problem if i were to ever go back? what can i do pre-downgrade, post-downgrade, and anything in between? thanks in advance!