This is just to let you all know that we have now updated our previous article about the untethered iOS 4.2.1 jailbreak using Redsn0w 0.9.7 with a complete step by step video guide. You can follow the well explained instructions in the video to jailbreak your compatible iPhone, iPad or iPod touch on iOS 4.2.1 using the newly released Redsn0w 0.9.7 beta.