Good news for all unlocked iDevice users with old basebands and waiting to use Redsn0w / PwangeTool for untethered iOS 4.3.1 jailbreak. The fix is developed by msft_guy and iH8sn0w. Ultrasn0w was previously unable to unlock iPhone 4 and 3GS devices after untethered iOS 4.3.1 jailbreak. But now you can use Ultrasn0w 4.3.1 fixer to unlock your device.

You need to have a jailbroken iOS device in order for iOS 4.3.1 unlock to work. You can jailbreak your device using Redsn0w 0.9.6 RC9, PwnageTool 4.3 or Sn0wbreeze 2.5.

The steps are as follows.

Step 1: At first launch Cydia in your jailbroken iPhone 4 or iPhone 3GS.

Step 2: Navigate to “Manage” and then “Sources”.

Step 3:

* Now “Edit” and then “Add”.
* Type the repo: “http://cydia.pushfix.info”
* Now “Add Source”

Step 4: Now press “Done”.

Step 5: Now select ”Pushfix.info” to Install it.

Step 6: Once its done with installation. Go to Pushfix.info. Scroll down to find “Ultrasn0w fixer for 4.3.1”. Select and to install the package. After that it will restart your device.

That’s it.

Thanks

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