GreenPois0n RC5 Untethered Jailbreak 4.2.1 iPhone 4 3GS [How to Video Guide]

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Greenpois0n RC5. Chronic Dev Team has finally announced the release of the long awaited GreenPois0n RC5. This tool brings untethered iOS 4.2.1 jailbreak for all iOS devices. Besides you do not need to have '4.2b3' SHSH blobs saved in Cydia, unlike the Redsn0w 0.9.7. Keep in mind, the software is only available for Mac OS X. A Windows version will be coming very soon.

Follow the below guide for step by step instructions to convert your tethered jailbreak to untethered jailbreak on iOS 4.2.1:

STEP 1: Your device must be on iOS 4.2.1, then download GreenPois0n RC5 for Mac OS X from here. [Mirror]

STEP 2: Launch GreenPois0n RC5 then connect your iPhone into your Mac via USB and click on Jailbreak as shown below:

STEP 3: Follow the instructions shown on the screen to enter DFU mode:

STEP 4: Once jailbroken, you'll get Cydia installed on your iOS device and you won't need to use Just tethered boot right now option anymore.

VIDEO GUIDE WATCH HERE!

UPDATE 1: GreenPois0n RC5_2 now available. It fixed bugs, including: GreenPois0n Initialized error.

UPDATE 2: If you are already have a tethered iOS 4.2.1 jailbreak using Redsn0w 0.9.6 on your device, just run GreenPois0n over it to untether iOS 4.2.1 jailbreak.