Unlock iPhone 4 and 3GS on iOS 5.1.1 with Ultrasn0w Fixer Patch [Old Basebands Only]

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Do you plan to update to iOS 5.1.1 but need to unlock your iPhone 4 or 3GS? Here’s the ultrasn0w fixer for iOS 5.1.1. Read below on how to install it.

UPDATE: Click here on how to officially unlock AT&T iPhone or click here for other worldwide network.

Important Notes:

Editor's note: learn more by reading our ebook on starting your own iPhone repair & unlock business

1. Your iPhone 4 or iPhone 3GS running on iOS 5.1.1 must already be jailbroken with its baseband preserved. You can jailbreak it with the latest redsn0w (download it from the Dev Team’s blog) or build a custom firmware using the same tool.

2. Supported basebands are listed below. Everything else is NOT supported.

  • 01.59.00 (iPhone 4)
  • 04.26.08 (iPhone 3GS)
  • 05.11.07 (iPhone 3GS)
  • 05.12.01 (iPhone 3GS)
  • 05.13.04 (iPhone 3GS)
  • 06.15.00 (iPhone 3GS)

Installation Steps:

1. Download i-FunBox for Windows or DiskAid for Mac.

2. Launch i-FunBox or DiskAid and go to /private/var/root/Media.

3. Inside Media folder create a folder called Cydia.

4. Now inside Cydia folder create an AutoInstall folder. Note: The folder name is case-sensitive so be sure to name it accurately. It should look like the following:


5. Now copy ultrasnow.deb [ultrasn0w_1.2.5.deb] file, MobileSubstrate [mobilesubstrate_0.9.3997_iphoneos-arm.deb] file and ultrasn0w fixer patch into the AutoInstall folder.

6. Reboot iPhone (remember it’s currently boot tethered! So start redsn0w > Extras > Just Boot).

These fixes were made by unknown hackers; so in order to play safe, you can wait for the Dev Team to release the official ultrasn0w that’s compatible with iOS 5.1.1.
Unlock iPhone 4 and 3GS on iOS 5.1.1 with Ultrasn0w Fixer Patch [Old Basebands Only] was last modified: October 18th, 2012 by Joe Wang

Comments & Discussion

  1. Someone Help, When i unlock my iPhone 4, and when it switch of, it lock back. And more so, the safari closes back when i open it. Please help

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