Untethered Greenp0ison Jailbreak IOS 4.2.1 for Windows and Mac

Hello iPhone maniac, please follow the instructions videotutorial, so you understand it perfectly this Jailbreak. If you need to Unlock your iPhone does not do anything in this tutorial since it is to unlock the iPhone for any cell phone company, however if your iPhone is Legal and Do Not Need Security You Can Unlock This Tutorial

The first video is for Mac, and the second video is for Windows.