Jailbreak: Greenpoison RC5 to iPhone, iPod Touch and iPad

Geekismo our friends leave us how to perform the Jailbreak Untethered devices with iOS 4.2.1. This version of Greenpoison RC5 supports the following devices: iPod Touch 2G, iPod Touch 3G, iPod Touch 4G, iPad, iPhone 3G, iPhone 4, iPhone 4 CDMA.
Steps:Download GreenPois0n RC5
Connect the device to your computer, run Greenpois0n and click on "Prepare to Jailbreak (DFU). "
Next you follow all the