I don’t usually dedicate much space here for jailbreaking news, but it’s a Saturday and news is slow. The Chronic dev team has released a new version of their GreenPois0n jailbreak for iOS 4.2.1. This is version RC6 for both Mac OS X and Windows.
No word yet on when the Linux version listed on their site will be released.
In addition to setting your iPhone 4, iPhone 3GS, iPad or later generation iPods free, this version will now also jailbreak the second generation Apple TV. This is an untethered jailbreak, meaning you can boot up your iOS device without being plugged into a computer.
Download and execute at your own risk.