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)

• iPhone 4
• iPhone 3GS
• iPhone 3G
• iPad
• iPod touch 2G
• iPod touch 3G
• iPod touch 4G

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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