I had a jb phone that had to get replaced. i restored it and itunes automaticly downloaded 3.1.3 so when i got my new iphone 3gs. it had 3.1.2 but i did "Restore to Back up" and it went to 3.1.3 i tried the whole shift+ restore and clicking on 3.1.2 but i will get a error. any ideas? or help?