How to Jailbreak iOS 4.2.1 Untethered with Redsn0w 0.9.7 [Guide]

iPhone Dev Team has just released a new Redsn0w 0.9.7 b1 version with a feature called “Jailbreak Monte” using the “Backup Method“, that allows to jailbreak (untethered) certain devices on iOS 4.2.1.

If you have already jailbroken (tethered) your idevice, you don’t need to jailbreak it again. Simple re-run this new version of Redsn0w and to get the untethered jailbreak state.

Here is the complete step by step guide to use Redsn0w 0.9.7 b1. Before you proceed, read the following “updated warnings/notes” from iPhone Dev Team:

  • This is a beta tester program. It’s not a general release!  Things can go very wrong, so please don’t even consider testing if you have pictures or other media on your device that you haven’t backed up!
  • For the same reason, please don’t participate if you rely on the ultrasn0w carrier unlock.  Wait for the final version!
  • Until we fix some sandbox issues with bluetooth, the bluetooth functionality is disabled.

Step 1: Jailbreak (tethered) your iPhone 4, iPad and / or iPod Touch on iOS 4.2.1. The complete instructions are available in  this post. If your device is already jailbroken, skip this step.

Step 2: This jailbreak method relies on iOS 4.2.1 b3 SHSH blobs. If you have not saved the SHSH blobs of iOS 4.2.1 Beta 3 on Cydia, don’t try this method because it won’t work for you.

Image Credit: iPhoneItalia

Step 3: Download Redsn0w 0.9.7 beta 1.

Step 4: Download usbmuxd software on your Mac and install it. Once Redsn0w 0.9.7 is out of beta, you won’t need this software.

Step 5: Now open Terminal in “Python Client” directory and run these commands:

chmod +x

./ -t 22:2222

Step 6: Start Redsn0w 0.9.7 and select the final iOS 4.2.1 ipsw file.

Step 7: After Redsn0w has successfully identified the IPSW file, click next.

Step 8: Select “Jailbreak Monte (untether)” option on Redsow and when it asks for IPSW file again, point it to iOS 4.2.1 beta 3 version.

Step 9: Click Next and follow the Redsn0w on-screen instructions to put your iPhone into DFU mode.

Step 10: Now sit back and let Redsn0w complete the rest of process. Once completed, your idevice will restart with fully untethered jailbroken state.


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Updated 12 years agoCategorized as Tutorials

By A. Usman

Loves new tech, especially from Apple and Google.

View all of A. Usman's posts.

6 Replies

  1. Erniesays:

    Is the Windows version out yet? :(

  2. sarysays:

    hello when i jailbreak my ipodtouch it well not work ……….. with limera1n

  3. Richardyeksays:

    if i use this version to jailbreak , i still need to jailbreak again when i restart my iphone ???

    1. How can I tell you if you don’t tell me your iPhone model??

  4. Poopsays:

    Waiting for windows =(

    1. Windows version is coming soon, hopefully within next week.

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