For those of you who have been waiting for an untethered iOS 4.2.1 jailbreak on your Apple TV 2G, iPhone 3GS, iPhone 4, iPod 2G, 3G, 4G and iPad, there is good news as the Chronic Dev Team has finally released GreenPois0n RC5 for Windows, and it is now available for download.
The best thing about GreenPois0n RC5 is that it does not require you to have SHSH blobs of iOS4.2b3 saved on Cydia in order to untether your iOS 4.2.1 jailbreak. You can easily jailbreak any of your iDevice straight out of the box using GreenPois0n RC5.
GreenPois0n RC5 for both Windows and Mac is compatible with iPhone 3GS, iPhone 4, iPod touch 2G, 3G, 4G, iPad and Apple TV 2G.
Download GreenPois0n RC5 for Windows
Download GreenPois0n RC5 for Mac