hi, I've searched for this answer, but everyone just refers to re-locking or restoring your iPhone, but doesn't make it clear how exactly you have to do it. I've got an iPhone unlocked with iPlus 2.0b, with bootloader 3.9FB. I'd like to restore it to a locked state with the normal bootloader (4.6?). If I just do an iTunes restore with my original ATT sim in there, will that upgrade the bootloader properly as well? thanks for any quick response. I'm sure this is dead easy, but the lack of actual details in people's posts makes me a tiny bit worried to mess it up.