This is just to let you all know that we have now updated our previous article about iOS 4.2.1 jailbreak using Redsn0w with a complete step by step video guide. You can follow the well explained instructions in the video to jailbreak iPhone 4, 3GS, 3G, iPad and iPod touch 4G / 3G / 2G using the newly released Redsn0w 0.9.6b4.
Rules of the game are same:
Redsn0w 0.9.6b4 is based on Geohot’s Limera1n bootrom exploit which has already pwned all current iOS devices for life. The only problem is that it is a tethered jailbreak, which means you will have to boot it into a “jailbroken state” on every reboot. This so called tethered or semi-tethered jailbreak condition in Redsn0w 0.9.6b4 however only applies to the new devices like: iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC Model), iPod touch 3G and the iPod touch 4G. Old devices like iPhone 3GS (old bootrom), iPhone 3G and iPod touch 2G (Non-MC Model) can be jailbroken-untethered right now using this latest version of Redsn0w. So until and unless Comex of Spirit and JailbreakMe fame comes up with another untethered hack for iOS 4.2.1, the jailbreak we get for the newer devices will be tethered (or semi-tethered).
Follow the steps as shown in the video embedded below to jailbreak your iOS device on the latest 4.2.1 firmware.
Written instructions can be found here.