GreenPois0n RC5 Released ! Here’s How to Untether iOS 4.2.1 Jailbreak !

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 1,Mirror 2]
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.

That’s it! Congratulations.

Via : http://www.ultrasn0w.ca/2011/02/greenpois0n-rc5-released-heres-how-to.html

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