Untethered Jailbreak iOS 4.2.1 with greenpois0n RC5 [Download]

iPadiPhoneiPodMacby Imran Hussain

An untethered iOS 4.2.1 jailbreak for iOS 4.2.1 on iPhone 4, iPhone 3GS, iPod touch 3G, iPod Touch 4G and iPad is now available in the form of greenpois0n RC5! This is excellent news for all those who were waiting for an untethered jailbreak for their iOS device to get rid of the annoying re-jailbreaking required on every restart, especially after installing Cydia apps.No longer do you have to rely on a tethered redsn0w jailbreak for iOS 4.2.1 though! Thanks to greenpois0n RC5 by the Chronic Dev Team.

Untethered Jailbreak iOS 4.2.1 with greenpois0n RC5 [Download]

A word of caution, though, greenpois0n is available for only Mac OS X for now. If you’re aware of how to work with greenpois0n, go ahead, download it from the link below and enjoy! Else you can wait for a while we compile easy and helpful guides for your iOS device and publish them!

Download greenpois0n RC5 for iOS 4.2.1 Jailbreak

Download greenpois0n RC5_2 for iOS 4.2.1 Jailbreak (fixed Stuck At Greenpois0n Initialized Screen Issue )

UPDATE: Our complete step-by-step guide is now available: How to use Greenpois0n RC5 To Untether Your Device On iOS 4.2.1.

About the Author

Imran Hussain is the founder and editor of iThinkDifferent, which he launched in 2008 to cover Apple news, reviews, and how-to guides. He has spent over 15 years writing about iOS, macOS, and the wider Apple ecosystem, with a focus on hands-on guides - installing developer betas, troubleshooting, and walking through new features on his own devices. Based in Dubai, he also loves to cover photography, gaming, and the tech industry more broadly on his social media profiles.