This morning we have informed you that the iPhone Dev Team will be releasing an updated version of Ultrasn0w 1.3 which will be capable of unlocking iPhone 4 with baseband 02.10 & 03.10 (iOS 4.1 & iOS 4.2.1).
As we have mentioned our previous post, there is a possibility of Ultrasn0w 1.2 supporting iPhone 4 baseband 04.10.1 (iOS 4.3b3) also.
This is now confirmed by @MuscleNerd, the core member of the iPhone Dev Team. It seems like there are vulnerable commands in baseband 04.10.01 (iOS 4.3b3) and they are working on invoking them. That means, iPhone 4 with baseband 04.10.01 is possible. But, its not confirmed.
@MuscleNerd – Current i4 unlock goal includes til 04.10.01 (4.3b3). Very weird situation…vuln cmds are there, trying to invoke them)Now, it will be interesting to see if the final version of iOS 4.3 carries the baseband as iOS 4.3b3 or not. Anyway, I strongly recommend you to stay away from iOS 4.3, if you relay on unlock. We will keep you posted on how to update your iPhone to iOS 4.3 while preserving your baseband.
So, currently we can confirm that Ultrasn0w 1.3 will support iPhone 4 with baseband 02.10 & 03.10 (iOS 4.1 & iOS 4.2.1) and possiblely 04.10.01 (Which is yet to confirm). The iPhone Dev Team is planning to release Ultrasn0w 1.3 in a week or two after the release of the Final version of iOS 4.3 (Release on March 2nd, 2011). So stay tuned..
For iPhone 3G & iPhone 3GS users, there is no unlock news for you. For now, all you can do is, update your baseband to iPad baseband 06.15 and use the current version of Ultrasn0w to unlock. Rumor has that, the iPhone Dev Team is working on a tool, with which you can downgrade your baseband. But there is no ETA on it.