As you may already know Ultrasn0w unlock was broken on iOS 4.3 but now iH8sn0w (iPhon developer and hacker) has released an updated version of Sn0wbreeze which now supports Ultrasn0w to unlock iPhone 4 and 3GS on older baseband (01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00) running iOS 4.3.

Full Change Log

• ultrasn0w now works for basebands (01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00)
• ultrasn0w is NOT compatible with the folllowing basebands! (02.10.04 / 03.10.01 / 04.10.01 / 05.14.02 / 05.15.04)
• Upgrading your iPhone 3GS baseband to the 06.15.00 iPad baseband hack to unlock MAY cause you to lose your GPS!
• Fixed minor GUI + iBooty bugs.

Note: If your iPhone 3GS is running on BB 05.14.02  or 05.15.04, then make sure you first update your baseband to 06.15.00 and then unlock it.

Step1: Download Latest Sn0wbreeze 2.3b4

Step2: Jailbreak your Device with latest Sn0wbreeze, Follow our Guide here to tethered Jailbreak your iPhone.

How to: Unlock iPhone 4, 3GS running iOS 4.3 with Ultrasn0w Unlock old baseband:

Step3: Go to cydia than manage tab as shown below:

Step4: Go to sources and than click edit and than add:

Step5: write http://repo666.ultrasn0w.com and click “Add source”

Step6: Once the repository has been added successfully, Search for “ultrasn0w” in Cydia and install this application.

Step7: Click install. and restart your iPhone!!!! voila!!! your iPhone is now Unlock.

Keep in mind though that Ultrasn0w fix for iOS 4.3 is implemented in Sn0wbreeze 2.3 only. If you jailbreak your iPhone using PwnageTool on Mac then you wont be able to unlock it using Ultrasn0w.

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