Redsn0w 0.9.6b1 was released by Dev-Team today to jailbreak iPhone 3G and iPod Touch 2G on iOS 4.1 (final built). Although this version of Redsn0w is not meant for iOS 4.2 Beta, but advance users may give it a try. MuscleNerd, Dev-Team member has also confirmed that Redsn0w 0.9.6b1 can be used to jailbreak iOS 4.2 Beta but it can be bugy with no guarantees. Try this at your own risk!
Please note that Apple's developers account is necessary to register UDID and activate your iPhone 3G / iPod Touch 2G on iOS 4.2 Beta, so iOS 4.2 jailbreak with Redsn0w 0.9.6b1 is highly recommended for advance users. Moreover, if your iDevice rely on unlock, please stay away from this.
If you sure enough to give it a try, you can follow this step-wise guide for jailbreaking iOS 4.2 Beta with Redsn0w 0.9.6b1, just make sure you point 4.1 ipsw instead of the 4.0 in step-5.Contact Us for News Tips, Corrections and Feedback