Ok follow my steps it has worked for both my iphone 3gs. Update ur device via itunes to 5.1.1 if it fails or gives errors then use the latest snowbreeze to cook a custom 5.1.1 firmware den dfu ur device n restore using that in itunes it will be tethered but u download rocky racoon 5.1.1 untethered from cydia to untether ur device..
I was about to upgrade to 5.1.1 on my iPhone 4S AT&T. I am currently running 5.0 with 1.0.11 baseband and I am going to take a trip abroad and wanted to use another GSM sim card. I know there isn't a software unlock currently available, but I was wondering what baseband is associated with the 5.1.1 upgrade? The Gevey Ultra website says that it works with "1.0.11, 1.013, 1.0.14, 2.0.10 and 2.0.12." I don't want to upgrade to 5.1.1 only to find out the updated baseband isn't supported. Can anyone check their AT&T 4S for me please?