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The latest version of ultrasn0w, which is just released; is compatible with iOS 4.3.1 So now you can easily unlock iOS 4.3.1 with ultrasn0w. I want to recall you that iPhone Dev Team recently launched untethered solution for iOS 4.3.1 on April 3rd, 2011 but it wasn’t compatible with iOS 4.3.1 but this version is compatible.

So this new version of ultrasn0w will unlock baseband 4.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00 for iPhon3 3GS and baseband 01.59.00 for iPhone 4.

So here’s a step by step guide on how to install ultrasn0w and how to unlock iOS 4.3.1-

Step 1: Launch Cydia Installer from your Springboard.

Step 2: Select the Manage tab at the bottom of the screen.

Step 3: Select the Large Sources button.

Step 4: Press the Edit button at the top right side of the screen.

Step 5: Press the Add button at the top left side of the screen.

Step 6: Enter http://repo666.ultrasn0w.com as the source url. After entering, press the Add Source button.

Step 7: Now press the Return to Cydia button.

Step 8: Now Press the Done button at the top right of the screen.

Step 9: Press to select http://repo666.ultrasn0w.com/ from the list of user entered sources.

Step 10: Now select ultrasn0w from the list of packages.

Step 11: Press the Install button at the top right side of the screen.

Step 12: Now press the confirm button.

Step 13: Now press the reboot button.

Step 14: Press the Home button then power off and power on your iPhone.

Cheers! You’re almost done. Now you should be able to insert the SIM of your choice. Enjoy!