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:
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