I'm selling a 2g iphone (3.1.3) modem firmware 04.05.04_G to a friend who wants to put it on T-mobile. we both tried black ra1n, snow breeze, red snow, black snow to try and unlock the dang thing but it wont work!!! we're having trouble finding the ipsw for 3.1.2 and 3.1.3 to do the unlocks because of windows 7. Can someone give me step-by-step clear instruction on how to do this?