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More info and download link: http://stateofjailbreak.com/tutorials/greenpois0n/
In this video I give a full tutorial on how to jailbreak your iPhone 3GS, iPhone 4, iPod touch 3G, iPod touch 4G and iPad using greenpois0n. greenpois0n is an untethered jailbreak for most devices on iOS 4.1 for the iPhone and iPod touch and iOS 3.2.2 for the iPad that works very similarly to limera1n.