How To Unlock iPhone 4 And 3GS On iOS 4.3.1 Using Ultrasn0w 1.2.1 ( Guide )


How To Unlock iPhone 4 And 3GS On iOS 4.3.1 Using Ultrasn0w 1.2.1 ( Guide )

If you have an iPhone 3GS or an iPhone 4 with iOS 4.3.1, you can unlock it with Ultrasnow 1.2.1 with newer basebands. The preserved jailbroken basebands on iOS 4.3.1, using PwnageTool or Sn0wbreeze are: 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00.

Only for iPhone 3GS users, you must update your device to the iPad baseband(06.15.00), using PwnageTool or Redsn0w. Very important: if you update your iPhone 3GS to the iPad baseband(06.15.00), you will lose the GPS functionality.

Here are the steps for How To Unlock iOS 4.3.1 on iPhone 4 or iPhone 3GS:

  1. First you must to jailbreak your iPhone 3GS or your iPhone 4 on iOS 4.3.1 and also you must to preserve the old baseband. You can use one of these programs: for Mac you can use PwnageTool and for Windows you can use Sn0wbreeze.

  2. After you have successfully jailbreak your device, you will be able to unlock the supported basebands, using Ultrasn0w 1.2.1 from Cydia.

  3. Now you must to start Cydia from your iPhone.

  4. In Cydia, you must to touch “Manage” button.

  5. And here, you must to touch “Sources”.

  6. Now you must to touch the “Edit” button, and then touch the “Add” button.

  7. Here you must to type an URL source: and now tap on the “Add source” button.

  8. Now the Cydia app will automatically update your sources.

  9. Go to “Search” section and type ultrasn0w 1.2.1 and install this application.

  10. And finally restart your iPhone. Now you will have a fully unlocked iPhone 4 or iPhone 3GS, with iOS 4.3.1.

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