I have an iPhone 3gs with firmware 3.1.2, I jailbroke it with redsnow and also unlocked it. What I don't like is that its a tethered jailbreak so I always have to hook the phone up to my computer in order to boot it. Im planning on selling it unlocked so I want to make using the phone as simple as possible for the buyer. So is there anyway to restore it completely and still have 3.1.2 on it? If so are there any other jailbreaks out that aren't tethered?