iPhone Dev Team has released redsn0w 0.9.7b6 untethered iOS 4.2.1 jailbreak. This latest redsn0w jailbreak includes fixes designed for Skype issues and presented designed for Mac OS X plus requires iOS 4.2 beta 3 SHSH blobs.
According to iPhone Dev Team:
“The sixth beta is now available (testers ONLY please!). This version fixes Skype. Please do not pirate the 4.2b3 IPSW! Only those enrolled in the iPhone Developer program have legitimate access to that IPSW using these links (http://pastie.org/1403214) (the links won’t work unless you’re a legit developer currently logged in).
Unlike the last few betas, you can freely run beta6 over beta5 without a problem (but for testing purposes, we’d really like people to try both ways….from stock, and from already jailbroken).
Now that the sandbox, Bluetooth, plus Skype issues are fixed, our next priority is porting Monte back toward 4.1. We’ll also try to create the Windows version less painfully slow.”