Unlock iPhone 4 iOS 5.1 using Ultrasn0w Fixer

Unlock for iPhone 4 on iOS 5.1 is here with Ultrasn0w Fixer 5.1 jailbreak app . Please note that Ultrasn0w fixer can only unlock iPhone 4 on preserved basebands (listed below) during iOS 5.1 firmware upgrade . Follow the Redsnow or Snowbreeze tutorial to Preserve Baseband during iOS 5.1 Upgrade .

iphone_4_unlock- 5.1 04.12.01

Supported Basebands :

  • 01.59.00
  • 04.26.08
  • 05.11.07
  • 05.13.01
  • 05.12.01
  • 06.15.00

Unsupported Basebands :

  • 04.11.08
  • 04.12.01

Steps to Unlock iPhone 4 iOS 5.1 using Ultrasn0w Fixer 5.1 :

  1. First upgrade to iOS 5.1 and jailbreak your iPhone 4 using baseband preservation method . Redsn0w / Snowbreeze
  2. Launch Cydia and go to Manage tab
  3. Add the following source http://repo.iparelhos.com
  4. After the repo had finished upgrading source packages , search and install Ultrasn0w Fixer 5.1
  5. After the fixer app is install , download Ultrasn0w 1.2.5 from Cydia and install it
  6. After the app is install your iPhone 4 will be unlocked to work with any carrier . See above for supported basebands

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