iOS 4.2.1 - iPhoneHeat

Jailbreak iOS 4.2.1 [All Guides]

You can jailbreak iOS 4.2.1 with Greenpois0n, RedSn0w and Seas0nPass. All iOS 4.2.1 jailbreak guides for iPhone 4, 3GS, 3G and iPod Touch 4G, 3G and 2G can be found below. We’ll update this post as soon as a new jailbreak for iOS 4.2.1 firmware is out. So, bookmark this page for future reference.

Download Greenpois0n RC5, Untethered Jailbreak iOS 4.2.1

Greenpois0n RC5, the untethered jailbreak for iOS 4.2.1 firmware is out now. You can download Greenpois0n RC5 from the link below. As the exploit has been patched in iOS 4.3, so the Chronic Dev Team went ahead and released the untethered iOS 4.2.1 jailbreak before iOS 4.3 goes live.