That’s right, the iOS 4.2.1 jailbreak by redsn0w is now available. One caveat: “the 4.2.1 jailbreak is currently “tethered” so owners of the iPhone 4, iPad, and newer iPhone 3GS and iPod touch will have to reattach to a PC or Mac to boot into a jailbroken state each time your device loses power or needs a reboot.” More information. Video after the break.

[via Engadget]