aniel - February 24, 2013 at 3:12am
I just managed to work things right for same model and firmware update:
Follow these steps:
1.Restore your iphone 3gs with itunes to 6.1.2
2.Use redsnow 0.9.15b3 to jailbreak ==> Extras===> Select ISPW====>Select===> Restore.ispw====> Select OK===> Back====>Jailbreak====> Only select insyall ipad baseband and NOT cydia.
3. After Completion your iphone will be activated. Wait more steps.
4. Download Evasi0n and run the tool with your iphone 3gs attached.
5. Dont do anything and let it again jailbreak 6.1.2
6. Once Done you would get Cydia on the homepage.
7. Open cydia and install source: repo666.ultrasn0w.com
8. Install ultrasn0w on iphone 3gs from cydia.
9. Your iphone 3gs is unlocked and any sim is activated.
10. Do a network setting reset again later for steady Network.
11. Done Cheers!