I need to restore my iPhone (currently OS 3.1.2) back to its original factory setting. If I do this through iTune, will I have to upgrade to the new OS 4.0? I don't wish to do that, as I have a new ibootrom, so I near that jail breaking in the new OS is not yet possible unless I have made some smart decision in the past, which I don't know if I did. Anyway, is there anyway I can restore factory settings WITHOUT upgrading to the latest firmware, ie. keep in 3.1.2? Thank you for your help.