iPhone 4.2.1 Jailbreak with Greenpois0n Untethered RC5-2 (Mac Guide)

iPhone 4.2.1 Jailbreak Untethered it is possible to Greenpois0n RC5-2. The trouble is that for now the tool is only available for Mac. Finally!
As we told you the other day, GreenPois0n , the tool that allows you to Jailbreak Untethered devices to IOS 4.2.1 directly, has finally seen the light. In this article we offer a complete guide on how to use it.
Warnings:This guide to iPhone 4.2.1