More info and download links: http://stateofjailbreak.com/tutorials/greenpoison-rc5-tutorial/
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In this video I give a full tutorial on how to jailbreak your iPhone 3GS (new and old bootrom), iPhone 4, iPod touch 2G (MB and MC model), iPod touch 3G, iPod touch 4G and iPad on iOS 4.2.1 untethered using greenpois0n RC5 for Windows.