Dev-Team Updates About iOS 4.2.1 – Including New Version of redsn0w Jailbreak

The Dev-Team has updated their blog with information about iOS 4.2.1. The first thing to note is that ultrasn0w unlockers should not upgrade to iOS 4.2.1 (read below for more info). The second bit of info is that they have updated redsn0w to version 0.9.6b4 which jaibreaks iOS 4.2.1 however, you will want to read all the info below because some devices are still a tethered jailbreak. redsn0w is available for both the Mac and PC (links below).
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