The iPhone Dev Team has released an updated version of Ultrasn0w unlock (Ultrasn0w 1.2.3) to make it compatible with iOS 4.3.3 on iPhone 4 and 3GS, running on the old baseband. For those who are not aware, this release of Ultrasn0w is not a new unlock for iPhones with newer basebands, instead, it only fixes the compatibility issues on the existing devices, which are jailbroken (with preserved basebands: 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00) on iOS 4.3.2 using PwnageTool 4.3.3 or Sn0wbreeze 2.7 Ultrasn0w 1.2.3 Compatible basebands for iOS 4.3.3: iPhone 4: 01.59.00iPhone 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 / 04.10.01iPhone 3GS: 05.14.02 / 05.15.04 / 05.15.04 / 05.16.01 / 05.16.02 Updating iPhone 3GS baseband to iPad’s 06.15.00 might result in loss of GPS functionality. Remember you need to have a jailbroken device first. You can get the following links if you have not already jailbroken your device on iOS 4.3.3. For iPhone 3GS Only: How to Update iPhone 3GS to 06.15.00 Baseband for Unlock: Ultrasn0w 1.2.x unlocking requires that your iPhone 3GS is jailbroken with 06.15.00 baseband. Follow the complete guide posted here (with PwnageTool) or here (for Redsn0w) to update your iPhone 3GS baseband to 06.15.00 and jailbreak it on iOS 4.1 / 4.2.1. We have posted a step by step guide here that walks through on how to apply the Ultrasn0w Fixer patch. If you do not rely on the unlock and want to jailbreak your device for an untethered boot, check out the links below: We will provide more info as it is made available, as usual, stay tuned by following us on Facebook, Twitter and/or by subscribing to our RSS Feed. Authors:

to know more click here