The iPhone Dev team has released Ultrasn0w Fixer, a new update that will allow unlockers to use iOS 5.1. If you were one of the unlucky users who had an unlocked iPhone but upgraded your iPhone to the new iOS 5.1, you are in luck.
There is a new fix that will allow users to keep their unlock while running on iOS 5.1. Ultrasn0w fixer only works for the following basebands:
If your baseband is not one of these mentioned above, then tough luck, Ultrasn0w Fixer will not help you. If your baseband is included on the list above then read on.
Steps to Unlock iPhone 4 and iPhone 3GS Using Ultrasn0w Fixer
The unlock using Ultrasn0w is pretty much straightforward if you have already unlocked your iPhone 3GS/4 before and know the basics. You will need to download Ultrasn0w Fixer from the following repo in Cydia (add this source):
If you want a more in depth guide on how to install ultrasn0w Fixer, read on for a step by step guide.
Pre-Requisites Before Starting:
Your iPhone needs to be jailbroken. This can be done through Redsn0w if it isn't already done. If you need to know how to jailbreak your iPhone using Redsn0w, please visit our tutorial on how to jailbreak your iPhone on iOS 5.1 using Redsn0w.
You also need to have your baseband preserved. This means that if you have upgraded without creating a custom ISPW, you are out of luck. In order for Ultrasn0w Fixer to work, you need to have one of the basebands mentioned above. If this is confusing to you and you need to know how to check your baseband, please visit our page about iPhone basebands.
1. Open Cydia and go to Sources
2. Add the source: http://repo.iparelhos.com
3. After adding the source go to search and search for "Ultrasn0w Fixer"
4. Install Ultrasn0w Fixer
5. After you install Ultrasn0w Fixer, go back into the search and install "Ultrasn0w"
6. That's it! Ultrasn0w Fixer is installed and Ultrasn0w should be working normally on your iPhone running iOS 5.1Contact Us for News Tips, Corrections and Feedback