Unlock iPhone 4 & iPhone 3GS on iOS 4.3.1 using Ultrasn0w 1.2.1
A new version of the Ultrasn0w iPhone carrier unlock utility has been released with iOS 4.3.1 support.
Note ultrasn0w 1.2.1 is not a new unlock and it will not unlock new baseband, but it does allow you to maintain your carrier unlock while upgrading to jailbroken iOS 4.3.1 using PwnageTool or Sn0wbreeze to preserve baseband.
UltraSn0w 1.2.1 will unlock iPhone 3GS or iPhone 4 on baseband 01.59.00, 04.26.08, 05.11.07, 05.12.01, 05.13.04, and 06.15.00, you can check your iPhone baseband from Settings > General > About. Any baseband outside of these versions is not currently unlockable.
Download & Install Ultrasn0w Unlock for iOS 4.3.1
Mac users will need to download PwnageTool 4.3.1, iOS 4.3.1 firmware, and jailbreak the iPhone iOS 4.3.1 using PwnageTool to preserve their existing baseband. Windows users can do this with Sn0wbreeze.
After you have upgraded to iOS 4.3.1 with preserved baseband, here’s how to download and install ultrasn0w 1.2.1:
- Launch Cydia
- Tap on “Manage”
- Tap on “Sources”
- Tap “Edit”
- Select “Add”
- Enter the following repository: http://repo666.ultrasn0w.com
- Tap on “Add Source”
- Cydia will add the source repo, now search for “ultrasn0w 1.2.1″ and download and install the unlock
- After ultrasn0w 1.2.1 has been installed, restart your iPhone
Your iPhone 4 or iPhone 3GS with preserved baseband will now be unlocked with iOS 4.3.1.