Are you planning to update your iPhone 4 or iPhone 3GS firmware to iOS 6.1 firmware but you rely on an unlock and afraid of losing the unlock but now there is a safe way to update to iOS 6.1 and unlock your iPhone 4 or 3GS baseband with Ultrasn0w 1.2.8.
Ultrasn0w 1.2.8 works only with old Basebands and the list of supported baseband is given below:
- Baseband 01.59.00 (iPhone 4)
- Baseband 04.26.08 (iPhone 3GS)
- Baseband 05.11.07 (iPhone 3GS)
- Baseband 05.12.01 (iPhone 3GS)
- Baseband 05.13.04 (iPhone 3GS)
- Baseband 06.15.00 (iPhone 3GS)
How To Unlock iPhone 4 and iPhone 3GS On iOS 6 With Ultrasn0w Fixer Patch
Step 1: Your iPhone 4 or iPhone 3GS must be jalbrken on iOS 6.1 firmware. Download latest version of Evasi0n jailbreak tool to jailbreak untethered.
Step 2: To install Ultrasn0w 1.2.8 open up Cydia and add the following repo by going to Manage > Sources > Edit > Add:
Step 4: Search for ultrasn0w fixer for iOS 6 and install it. After installing Ultrasn0w 1.2.8 and reboot your device.