redsn0w iOS 4.2.1 Untethered Jailbreak for iPhone, iPad, iPod touch Released [GUIDE]

iOS users, rejoice, as the Dev-Team just released the “backup plan” we mentioned earlier this week (see here). Named Redsn0w 0.9.7 beta 1, the jailbreak is compatible with all iOS 4.2.1 powered devices, and is of course untethered. The software is still at a beta stage, but based on our early tests, the jailbreak works well. Windows users will have to wait a bit longer, as the software is only compatible with Macs for now. To perform the jailbreak, you will need the following:
  • An iPhone, iPad or iPod touch running iOS 4.2.1
  • A Mac running OS X with iTunes 10.1.1
  • The official iOS 4.2.1 firmware for your device (IPSW build 8C148, you can easily find it on the web)
  • The iOS 4.2 beta 3 firmware for your device (IPSW build 8C5115c, you can easily find it on the web)
  • redsnow 0.9.7 beta 1 (link)
  • Marcansoft’s usbmuxd (link)
Note that even though this method worked for us, it does not mean it will work for you. In other words, we cannot be held responsible for your actions, so perform the jailbreak at your own risk! The jailbreak is a bit involving, so if you are afraid to brick your device, just wait for the official, non-beta release to be available. Step 1: Backup your device! This is a beta tester program, if something goes wrong, you’ll be happy to have your own “backup plan”. Step 2: Restore your device with the official iOS 4.2.1 firmware via iTunes (connect your device to your Mac, fire up iTunes, and hit “Restore”). Step 3: Extract the usbmuxd package on your desktop. Fire up the OS X terminal, go to the “python-client” directory (it should be under Desktop/usbmuxd-1.0.6/python-client, you can get there by entering “cd Desktop”, then “cd usbmuxd-1.0.6”, then “cd python-client”). From the “python-client” directory, type the following commands:
  • chmod 777
  • ./ -t 22:2222
Step 4: Fire up the redsn0w tool, point it to the official iOS 4.2.1 firmware for your device.

Step 5: In order to get the jailbreak to work, you will need to use the SHSH blobs from iOS 4.2 beta 3. When you reach the following screen, hit the “Jailbreak Monte (untether)” option, and point the tool to the iOS 4.2 beta 3 firmware for your device.

Step 6: Plug your iOS-powered device in your Mac via USB, and turn it off (this is important). Hit next, the tool will ask you to hold down both power and home buttons simultaneously. Hold down the power button first, then hold down the home button without releasing the power button. Hold down both buttons until the program asks you to release the power button only. The installation should then begin.

Step 7: redsn0w will do the rest for you. Once jailbroken, your iOS powered device will restart automatically. And that’s it! Even though jailbreaking is considered legal, always keep in mind that Apple sees it as a warranty-voiding act, so do it at your own risk. Please do not use jailbreaks to install copyrighted/paid content you haven’t purchased yourself. Also note that we will not provide links to the firmware files (please use your favorite search engine instead).