A new version of jailbreaking tool for iOS devices such as iPhone, iPad and iPod touch running iOS version 4.2.1 has been released by iPhone Dev Team.Redsn0w 0.9.7, currently in beta 3, is able to jailbreak iPhone 4, iPad, and iPod touch 4G running on iOS 4.2.1. Here’s the step-by-step instructions for untethered jailbreaking with…