hey guys, forgive me if this has been answered already but I've been searching and searching and cannot find a solution. I have the iphone 3gs 4.2.1(8C148a) running 05.15.04 already jailbroken using greenpois0n. In the end I'd like to have the phone unlocked for tmobile and jailbroken using greenpois0n. The main problem I'm having is with pointing redsn0w to the current firmware... I've downloaded firmware packages from links on this site and others none seem to save as an .ipsw file. If someone could take the time to help me with a step by step walkthrough it would be very much appreciated, as I said before Iapologize if this is a duplicate post but again Icouldnt fine any helpful solutions as of yet. Thanks again