Im trying to sell my 3GS that has been jailbroken with blackra1n and unlocked with blacksn0w... Before I sell it to some stranger, I wanna clear all my personal stuff off of it. So if I were to reset from settings, "erase all content and settings", will it wipe my phone completely? Will it be like I just got it out of the box? Or do I have to sync it to iTunes to get the latest OS... Im running on 3.1.2(7D11) and DO NOT want to go to 3.1.3 and lose my unlock. What do you guys think?