Restoring stock iOS 4.3 IPSW to your iPhone 3GS upgrades its baseband to 05.16.01. To unlock iPhone 3GS baseband 05.16.01 with Ultrasn0w, you must upgrade it to iPad baseband 06.15.00. It is the same iPad baseband hack which can be used to unlock iPhone 3GS/3G 05.15.04 & 05.14.02 baseband.

Most of you already know that Ultrasn0w unlock was broken in iOS 4.3 due to ASLR security feature by Apple. Now that iH8sn0w has fixed Ultrasn0w on iOS 4.3 by releasing Sn0wbreeze 2.3b4, you can unlock your iPhone 4 and iPhone 3GS on iOS 4.3. Just download Sn0wbreeze 2.3b4 from here and follow this guide to jailbreak your iPhone using iOS 4.3 using custom IPSW. Once you have successfully jailbroken your iPhone on iOS 4.3,...

As expected, iH8sn0w has just pushed another beta of Sn0wbreeze 2.3 which now incorporates Msft.Guy's Ultrasn0w Fix to unlock iPhone 4 and iPhone 3GS on iOS 4.3. Apart from Ultrasn0w Fix, Sn0wbreeze 2.3b4 comes with a fix for some minor GUI and iBooty bugs.

iH8sn0w, the man behind Sn0wbreeze, iREB and iBooty tool has confirmed that Ultrasn0w Fix for iPhone 3GS users will be incorporated in the next beta release of Sn0wbreeze 2.3. For those who don't know, Ultrasn0w and MobileSubstrate were broken in iOS 4.3 due to Apple's new ASLR feature. MobileSubstrate has already been fixed in Sn0wbreeze 2.3b2 while Ultrasn0w is still broken.

Yep! You read the title right. As most of you already know that Ultrasn0w unlock tool is broken on iOS 4.3, Msft.Guy (@msft_guy) has released an Ultrasn0w Fixer tool which fixes Ultrasn0w on iPhone 3GS running jailbroken iOS 4.3 on it. iH8sn0w has just released a quick video demo of this Ultrasn0w Fixer featuring his unlocked iPhone 3GS which appears to be running iOS 4.3 GM.

Here is a quick update for those who are waiting for iPhone 4 02.10.04 and 03.10.01 baseband unlock. According to the recent tweet by MuscleNerd, Ultrasn0w unlock for iPhone 4 with 02.10.04 or 03.10.01 baseband might get delayed for some more days or may be weeks. Earlier, MuscleNerd confirmed that he will not release unlock until Apple releases iOS 4.3 publicly. Now that Apple has released iOS 4.3, everyone was expecting the unlock within a...

Many people faced battery drainage, device overheating and push notification issues after jailbreaking their iPhone on iOS 4.2.1 and and unlocking it with Ultrasn0w 1.2. Sam Bingner, an iPhone developer has provided a solution to these problems by releasing Subscriber Artificial Module (SAM). It's a method to officially activate your iPhone without using an official carrier SIM.

Last weekend, iPhone Dev-Team released Ultrasn0w 1.2 to unlock iOS 4.1/4.2.1 on iPhone 3GS/3G. After unlocking baseband 06.15.00 with Ultrasn0w, many users reported drastic drop in iPhone battery level and iPhone overheating issues. Sherif Hashim, a known iPhone baseband hacker, has shared his thoughts on the mentioned problems and suggested some possible resolutions. Details after the break.

Finally! As promised, iPhone Dev-Team has released Ultrasn0w (v1.2) tool to unlock iOS 4.1/4.2.1 on iPhone 3GS and iPhone 3G. Ultrasn0w 1.2 can unlock 01.59.00 baseband on iPhone 4 and iPhone 3GS/3G basebands 04.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00.

According to Vincet, admin of iPhone Wiki, Ultrasn0w unlock for iPhone 4 02.10.04/03.10.01 baseband is not easy to crack and it might take a while before iPhone 4 users will be able to unlock their devices. For those who don't know, updating to iOS 4.1 on iPhone 4 upgrades its baseband to 02.10.04 and updating iOS 4.2.1 upgrades its baseband to 03.10.01.