The Chronic Dev Team has released an updated version of its Greenpois0n utility that allows you to jailbreak your favorite iOS devices running iOS 4.2.1. The good news about this new release is that the utility will perform an untethered jailbreak, which means you can reboot the device without having to have it tethered to your computer.
This version is new and I haven’t tested it myself yet, but from what I am hearing there may be a few problems with the utility so you might want to wait a while before using it.
Greenpois0n is currently only available for the Mac and it isn’t recommended for people who have unlocked iDevices or are interested in unlocking.
- Via iClarified