Untethered Jailbreak iOS 4.2.1 iPhone 4, iPad, iPod Touch

With Redsn0w 0.9.7 you can now achieve untethered jailbreak for iPhone 4, iPad and iPod touch 4G on iOS 4.2.1.

Important: You must satisfy all pre-requisites mentioned below:

  • iPhone 4, iPad or iPod touch 4g running iOS 4.2.1
  • iPhone, iPad or iPod touch with SHSH blobs saved for iOS 4.2 Beta 3.
  • Mac OS X (Hackintosh or virgin)
  • Access to iOS 4.2 Beta 3 firmware
  • If you’ve used Ultrasn0w for unlock, you MUST STAY AWAY.
  • iTunes 10.1.1
  • This is a beta test build, do not attempt this method if you are not ready for bugs.

Download iOS 4.2.1 (Official from Apple)

Update: Untethered Jailbreak iOS 4.2.1 iPhone 4, 3GS, iPod Touch, iPad [Greenpois0n] No SHSH blobs needed

How to Jailbreak (untethered) iPhone 4, iPad, iPod Touch iOS 4.2.1

1: If your iPhone is not already Jailbroken (tethered), you must follow instructions to Restore your iOS device to the official iOS 4.2.1 firmware and jailbreak it, else move on.

2: We would need SHSH blobs saved for 4.2b3 (iOS 4.2 Beta 3). To verify, start Cydia and wait for it to completely load the main page. You should now see “SHSH: 4.2b3” on top as shown in the screenshot below:


3: Download Redsn0w 0.9.6b7 and connect your iPhone, iPad or iPod touch with Mac and download usbmuxd from here and extract it on your computer.

4: Open Terminal in python-client directory and then run the following commands below”:

chmod +x tcprelay.py

./tcprelay.py -t 22:2222

5: Start Redsn0w and browse it to the official iOS 4.2.1 firmware. Now click “Next” and select “Jailbreak Monte” option, followed by browsing and selecting iOS 4.2 Beta 3 firmware file.

6: Check mark “Jailbreak Monte (untether)”, “Install Cydia” if not already. Leave all others unchecked.


7: Make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.

Now you will have to enter DFU mode. Follow the onscreen instructions.

8: Sit back and relax as Redsn0w will do all the magic . When its done, your Device will automatically boot into a fully jailbroken (untethered) iOS 4.2.1 firmware.

Update: Jailbreak iOS 4.2.1 Untethered, Preserve Baseband with sn0wbreeze 2.2.1

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  • Rahul Aggarwal

    Though it is an excellent news but there are lot of hidden blockers which yet need to be addressed before it can be used by a naive such as me. The current jailbreak disables BT, works only with Mac OS X, only works for the current models of iDevices (iPhone 4, iPod Touch 4G, iPad).

    Rahul Aggarwal
    Mobile Application Development

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  • Ravi jaggi

    wat abt people with windows ?????

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