As we expected, the dev-team has just sent a new blog post update announcing the release of Redsn0w 0.9.6b4 to jailbreak the newly released iOS 4.2.1 on iPhone, iPod touch and iPad, for who don't know, Redsn0w 0.9.6 B4 is based on GeoHot’s limera1n bootrom exploit exploit.
redsn0w version 0.9.6b4 is now available for your 4.2.1 jailbreaking pleasure. Please read all the above to understand what this jailbreak currently entails.As usual we will prepare the full how to guide to jailbreak all iDevices on iOS 4.2.1, for now you can check the full details about i|OS 4.2.1 jailbreak and unlock in this post.
Update 1: Here is the full guide to jailbreak iOS 4.2.1 on iPhone, iPod touch and iPad using Redsn0w 0.9.6b4 posted here.
Download redsn0w jailbreak for iOS 4.2.1 on iPhone, iPod touch and iPad [Windows and Mac]