So I received a new iphone 3gs running 3.0.1 (7A400)... it's a newer MC143C model. Baseband 04.26.08 I managed to jailbreak it using ultrasnow pretty easily, and have backed up shshs to Cydia - albeit 3.1.3 as that is all apple is signing now. My question for the experts is "how do I upgrade my iphone to a later OS such a 3.1.2" so I can use apps like layer and snapture. I don't want to go to 3.1.3 for obvious reasons. I would prefer to do this without losing my jailbreak but dont mind re jailbreaking after from 3.1.2 as I think thats possible.... Any help would surely be useful to me and others.... since I havent seen this particular topic covered here. Will pwnge work for me if so what do i do for my unique situation??