How to unlock iOS 5.1 Using Ultrasn0w 1.2.5 on your iPhone 4,3GS1. Run Cydia and tap Manage 2. Go to sources 3. Tap Edit and then tap Add button 4. After you see the form to type url then type this: http://repo.iparelhos.com and tap Add Source. Downloading process won’t be long and after it finishes return to Cydia and tap done. Then you can see ultrasn0w fixer in the list of sources so install it and move back to Cydia. 5. Now you need to find ultrasn0w 1.2.5 in Cydia. Just type ultrasn0w in the Search form and pick ultrasn0w fixer for 5.1. 6. After you find it, just install ultrasn0w 1.2.5 to unlock iOS 5.1. This process running automatically. 7. And the last step you must do is to reboot your iPhone 4,3GS. To complete this unlock follow this link and finish it. After rebooting you can use any Sim card you want on your unlocked iPhone 4 and 3GS on iOS 5.1 using Ultrasn0w 1.2.5 fixer.
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