Jailbreak iOS 4.2.1 - Sn0wbreeze


Supported devices:
  • iPhone 4, 3GS, 3G
  • iPod touch 4G, 3G, 2G
  • iPad
You can follow the below video guide, to jailbreak your iOS device running iOS 4.2.1 and preserve your unlockable baseband, then unlock using ultrasn0w.