The long awaited GreenPois0n RC5 untethered jailbreak tool for iOS 4.2.1 has been released finally.
The Greenpoison release was delayed due to it’s compatibility issue with iOS 4.3, but now it’s finally out!
The great thing about Greenpois0n RC5 is that it’s untethered and won’t require you to have SHSH blobs of iOS 4.3b3 saved on Cydia to have an untethered Jailbreak of your iPhone. Previously the only way to get your iPhone have untethered Jailbreak on iOS 4.2.1 was through Redsn0w 0.9.7 and it needed SHSH blob.
Greenpois0n RC5 supports Apple iPhone 3Gs, iPhone 4, iPod touch 2g,3g,4g and iPad.
Download (Link not working: http://www.greenpois0n.com/ )Greenpois0n RC5 untethered jailbreak tool.