i have an iphone 3gs version 3.1.2 jail broken with blackra1n. it's jail broken because i live in israel and otherwise the sim wont work. i want to upgrade to the new version (ios 4) with jailbreak me. before i do this i want to know if there are any risks, and if my sim will work after i do this? is it reversible? is there a chance my iphone wont work at all if i do this? itunes doesn't recognize my iphone because it is jail broken, will i be able to use itunes if i upgrade?
Thanks!!
Thanks!!