How To Unlock iPhone 4, 3GS on iOS 4.3.1 with Ultrasn0w 1.2.1

Written by Gradly on . Posted in Apple, blog, Download, How To, iPhone, Jailbreak

How To Unlock iPhone 4, 3GS on iOS 4.3.1 with Ultrasn0w 1.2.1
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iPhone Dev Team has released Ultrasn0w 1.2.1 unlock for iOS 4.3.1. The unlock tool can be used with iPhone 4 and iPhone 3GS. Its not a new unlock, it can only unlock lower basebands whose unlock was already possible but broken on iOS 4.3.1. Ultrsn0w 1.2.1 WILL NOT unlock higher basebands whose unlock is not possible right now.

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.

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.
How To Guides for Untethered 4.3.1 Jailbreak on Windows & Mac
How To Guides for Untethered 4.3.1 Jailbreak on Windows & Mac

Step 1: You have to jailbreak your iPhone 4 / 3GS on iOS 4.3.1 with preserving your old baseband, follow this guide (PwnageTool 4.3 for Mac) or (Sn0wbreeze 2.5 Windows)

Step 2: Once you jailbreak yoour device, you can now unlock your iPhone 4 / 3GS with Ultrasn0w 1.2.1 from Cydia. To do so, follow the steps below:

  • Press to launch Cydia Installer from your SpringBoard.
  • Press to select the Manage tab at the bottom of the screen.
  • Press to select the Sources button.
  • Now touch on Edit and then on Add. You will be prompted to enter the URL of the source. Type http://repo666.ultrasn0w.com and touch on Add Source to add this repository.

Cydia will now automatically update your sources by following a series of automated steps.

  • After installation is completed. Search for “ultrasn0w 1.2.1” in Cydia and install this application. This app will automatically unlock your iPhone so that you can use it with any carrier.
Step 3: Almost done, now simply reboot your iPhone and you should have a fully unlocked iPhone 3GS / 4 on iOS 4.3.1.

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Gradly

Gradly is a blogger and technology enthusiast, keeping you all posted about new & cool stuff. You can also remain in contact by Following Him on Twitter, be friend on Facebook and on Google+. Gradly also happen to be a designer, a photographer, a blogger and an avid reader!

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