Hey guys, Newbie here! I have been reading up on jb/ unlocking and I have a question: I am thinking about selling my 3g with 3.1.3 jb/unlocked because of the bad things I've been reading about 4.0 on 3g (maybe I'll get more money with 3.1.3?). How do I erase the phone and keep 3.1.3? If I erase content/settings and try to restore as new, won't iTunes make me update to 4.0? The phone is currently 3.1.3 & not jb or unlocked. Thanks for any help, I can't believe the amount of tech knowledge on this forum!