I am trying to upgrade my GFs iPhone 3G to iOS 4.2.1. I did it once, but couldn't get 3G data to work, so I tried again but am now stuck at the iTunes/USB screen. I have Pwnage Tool 4.1.2 & RedSn0w 0.96rc18 and the 4.1.2 IPSW, but going through RedSn0w for a second time left me back at the connect to itunes screen.
Any tips?
Okay - I have it running 4.2.1 again and with baseband 06.15.00 - jut installing UltraSn0w now.