It’s really a big news for all those who are waiting for iOS 4.2.1 unlock. In a reply to a user over Twitter, MuscleNerd, the key member of iPhone Dev Team disclosed that Ultrasn0w unlock for iOS 4.2.1 running on iPhone 3GS and 3G might be released this week.
However other users, especially iPhone 4 users, will have to wait little longer to get the working version of Ultrasnow to unlock iPhone 4 on iOS 4.2.1.
hiemanshu: @MuscleNerd any ETA on unlock or should I say unl0ck :)
MuscleNerd: @hiemanshu now that redsn0w is out, can focus back on the unlock. The 3G/3GS version should be out this week. i4 will be longer.
Due to change in baseband, the existing version of Ultrasn0w doesn’t work on iOS 4.1 and above. So all those users who rely on unlock are still on iOS 4.1 and waiting for an unlock.
And if you landed on this page looking for iOS 4.2.1 jailbreak only, you can visit our step by step guide to jailbreak all iDevices on iOS 4.2.1 with Redsn0w 0.9.6 beta 4.