Safely Update to iOS 5.1.1 and Unlock iPhone 4 or 3GS with Sn0wbreeze Custom Firmware
If you use ultrasn0w or Gevey SIM to unlock your iPhone, here’s the ultimate guide to safely update to iOS 5.1.1 while preserving your baseband. You’ve probably read the following countless times, but if you’re new to using locked iPhone, it may be worthwhile...