Unlock iPhone 4 4.3.1 With Ultrasn0w 1.2.1

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by casey on April 11, 2011

As we have already updated you about the Ultrasn0w 1.2.1 unlock for iOS 4.3.1 for iPhone 4 and iPhone 3GS by iPhone Dev Team. After this great news we are now here to show you a HOW TO GUIDEUltrsn0w 1.2.1 WILL NOT unlock higher basebands whose unlock is not possible right now. Its not a new unlock, it can only unlock lower basebands whose unlock was already possible but broken on iOS 4.3.1. Find the how to guide after a break.

If you have upgraded to iOS 4.3.1 firmware and jailbroken you device with PwnageTool 4.3 or Sn0wbreeze 2.5 and requires an unlock then you can use Ultrasn0w 1.2.1. Check out the compatible baseband list below.

Compatible basebands with Ultrasn0w 1.2.1:

iPhone 4: 01.59.00
iPhone 3GS: 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00

DO NOT USE WITH the following basebands:

iPhone 4: 02.10.04 / 03.10.01 / 04.10.01
iPhone 3GS: 05.14.02 / 05.15.04 / 05.15.04 / 05.16.01 / 05.16.02

Remember you need to have a jailbroken device with PwnageTool 4.3 and Sn0wbreeze 2.5. You can get the following gudies if you have not already jailbroken your device on iOS 4.3.1.

How To Guides for Untethered 4.3.1 Jailbreak on Windows & Mac

After jailbreaking 4.3.1 using above guides, you can unlock iOS 4.3.1 with Ultrasn0w 1.2.1. Here is how to do it.

How to Guide To Use Ultrasn0w fixer for iOS 4.3.1 to Unlock iPhone 4

Step 1: Launch Cydia on your jailbroken iPhone 4.

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

Ultrasn0w 1.2.1 - 1

Step 3:

  • Now “Edit” and then “Add”.
  • Type the repo: “http://repo666.ultrasn0w.com”
  • Now “Add Source”

Ultrasn0w 1.2.1 - 2

Step 6: Once its done with installation, find “Ultrasn0w 1.2.1”. Select and to install the package. After that it will restart your device.

Ultrasn0w 1.2.1 - 3

Thats it! Congratulations! Your device is now unlocked on iOS 4.3.1 on basebands 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00. Kindly DO NOT use it other than the mentioned basebands.

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  • Malaver_ra

    what do i do if i have the 05.16.02 firmware in the phone? how do i change it?

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