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How to Use PwnageTool 4.2 for Untethered iOS 4.2.1 Jailbreak [Step-by-Step Guide]

iPhone Dev-Team has just released PwnageTool 4.2 for untethered iOS 4.2.1 jailbreak on iPhone 4/3GS/3G, Verizon iPhone, iPod Touch 4G/3G, iPad and Apple TV 2G. With PwnageTool 4.2, you can create iOS 4.2.1 custom IPSW on Mac OS X for your iPhone, which on restore via iTunes will jailbreak it while preserving its baseband.

PwnageTool 4.2 Main
PwnageTool 4.2 comes with a fix for all iBooks and Wifi related issues. If you have already jailbroken your iPhone, iPod Touch or iPad with GreenPois0n tool, you do not need to re-jailbreak your iDevice with PwnageTool 4.2 as these fixes will be available to you via Cydia update packages.

Steps to Jailbreak iOS 4.2.1 on Mac With PwnageTool 4.2:

*Find the download links at the bottom of this post

  1. *Download iTunes 10.1.2 for Mac OS X
  2. *Download iOS 4.2.1 firmware file for your iDevice.
  3. *Download PwnageTool 4.2
  4. Create a new folder on your desktop i-e iOS 4.2.1
  5. Put iOS 4.2.1 firmware file and PwnageTool 4.2 in the directory you created in step 4.
  6. PwnageTool and iOS 4.2.1 IPSW

  7. Launch PwnageTool and click 'OK' button to discard the disclaimer message.
  8. PwnageTool Disclaimer Message

  9. Choose 'Expert Mode' from the top and select your iDevice type from the available options. As i want to jailbreak my iPhone 4 on iOS 4.2.1, so i will be choosing the first option i-e 'iPhone 3G, 3GS, 4'. After choosing 'Expert Mode' and selecting your iDevice, click on the 'Next' button.
  10. PwnageTool 4.2 - Select iDevice

  11. Now PwnageTool will detect iOS 4.2.1 IPSW(s) available in the directory automatically. If the firmware file for your iDevice is not automatically detected, click on the 'Browse for IPSW...' button to choose it manually and click on the 'Next' button.
  12. PwnageTool 4.2 - Choose IPSW

  13. Select the 'General' tab and click on the 'Next' button.
  14. PwnagrTool 4.2 - General Mode

  15. If you rely on unlock and do not have an official contract SIM card, just keep the 'Activate the iPhone' option checked and click on 'Next' button. If you have a legitimate official carrier SIM card, simply un-check 'Activate the iPhone' option. All other check-boxes are optional and some features are disabled as they are natively available on that iDevice in iOS 4.2.1.
  16. PwnageTool 4.2 - Uncheck Activate the iPhone

  17. In the 'Download packages' tab, first hit the 'Refresh' button and then double-click on the 'OpenSSH' to download the package.
  18. PwnageTool 4.2 - Install OpenSSH

  19. Click on the 'Select packages' tab and make sure 'OpenSSH' is checked. Click on the 'Next' button to continue.
  20. PwnageTool 4.2 - Select OpenSSH

  21. Click on the 'Build' button and click on 'Next' button.
  22. PwnageTool 4.2 - Build Mode

  23. PwnageTool will prompt you for the location to save iOS 4.2.1 IPSW. Choose 'Desktop' and click on the 'Save' button.
  24. Save iOS 4.2.1 IPSW

  25. Now wait while PwnageTool creates iOS 4.2.1 custom IPSW for your iPhone.
  26. PwnageTool 4.2 - Building iOS 4.2.1 Custom IPSW

  27. During the creation of custom IPSW of iOS 4.2.1, PwnageTool might prompt you to enter your Administrator password.
  28. PwnageTool Password

  29. Once PwnageTool has created iOS 4.2.1 custom IPSW for your iPhone, use the following instructions to put it in DFU mode.
    • Turn off your iPhone completely
    • Press and hold the 'Home'+'Power' button simultaneously for 10 seconds.
    • After 10 seconds, release the 'Power' button but keep holding the 'Home' button until Sn0wbreeze detects your iPhone in DFU mode.

    PwnageTool 4.2 - DFU Mode

  30. Close the PwnageTool and follow the instructions below to restore iOS 4.2.1 custom IPSW on your iPhone. Make sure iOS 4.2.1 custom IPSW is present on your desktop.
  31. iPhone 4: iPhone3,1_4.2.1_8C148_Custom_Restore
    iPhone 3GS: iPhone2,1_4.2.1_8C148a_Custom_Restore
    iPhone 3G: iPhone1,2_4.2.1_8C148_Custom_Restore
    iPad: iPad1,1_4.2.1_8C148_Custom_Restore
    iPod Touch 4G: iPod2,1_4.2.1_8C148_Custom_Restore.ipsw
    iPod Touch 3G: iPod3,1_4.2.1_8C148_Custom_Restore.ipsw
    iPod Touch 2G: iPod4,1_4.2.1_8C148_Custom_Restore.ipsw

Steps to Restore iOS 4.2.1 Custom IPSW Though iTunes:

Select Device from iTunesOnce you have successfully created the iOS 4.2.1 custom IPSW through PwnageTool 4.2 and your iPhone is in DFU mode, launch iTunes and click on the name of the device from the side-panel to view the summary page.
Restore Through iTunes
Now you will see two buttons, Check for Updates and Restore. Hold down the ALT key (SHIFT for Windows) and click on the Restore button to browse for iOS 4.2.1 custom IPSW file you just created with the PwnageTool 4.2.

iTunes Restore FirmwareAbove image is for illustration purpose only

Now wait until iTunes restores the custom cooked iOS 4.2.1 IPSW on your iPhone. Once done, enjoy your fully untethered jailbroken iPhone on iOS 4.2.1. Now that you have preserved your baseband using PwnageTool, you can unlock your iPhone using the latest version of Ultrasn0w tool. Click here for step-by-step instructions to unlock your iPhone with Ultrasn0w 1.2.

Update#1: Download Sn0wbreeze 2.2 for untethered iOS 4.2.1 jailbreak on Windows
Update#2: Sn0wbreeze 2.2 for untethered iOS 4.2.1 jailbreak on Windows [How-To Guide]

Download Links:

Download iTunes 10.1.2 for Mac OS X
Download PwnageTool 4.2 for Mac OS X
Download iOS 4.2.1 for iPhone 4/3GS/3G, iPod Touch 4G/3G/2G & iPad

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Leave a message...

    Gregory10 years, 6 months ago

    I’ve done this process with all current versions on iTunes (10.2.1), Pwnage Tool (4.2), and iOS 4.2.1 on both a brand new 3GS and an older 3G.

    Same thing happens every time. I open Cydia and it hangs for about two – four seconds and then closes.

    I’ve added OpenSSH and for whatever reason it doesn’t show up. Even so, I wouldn’t even know where to begin getting Cydia through OpenSSH.

    Why are there people like me having exactly the same issue? Is there something wrong with our USB ports, iPhone cables, version of Snow Leopard…. I really can’t imagine what would be interfering.

    Please help!!!

    PC10 years, 6 months ago

    I don’t see the ‘OpenSSH’ within the download package list. Also I can not download the Cydia package…have most other people been able to move forward and get the OpenSSH?


      Wolverine10 years, 6 months ago

      Add the DEBs of both OpenSSH and Cydia manually under Select packages tab. Google for OpenSSH and Cydia DEB files.

    Ben Johnson10 years, 7 months ago

    Ok, here are the iOS 4.2.1 custom IPSWs for all iDevices created with PwnageTool 4.2:
    **All functions enabled
    *No extra function enabled

    iPhone 4: iPhone3,1_4.2.1_8C148_Custom_Restore.ipsw
    iPhone 3GS: iPhone2,1_4.2.1_8C148a_Custom_Restore.ipsw
    iPhone 3G: iPhone1,2_4.2.1_8C148_Custom_Restore.ipsw
    iPod Touch 4G: iPod4,1_4.2.1_8C148_Custom_Restore.ipsw
    iPod Touch 3G: iPod3,1_4.2.1_8C148_Custom_Restore.ipsw
    iPad (Wifi+3G): iPad1,1_4.2.1_8C148_Custom_Restore.ipsw
    Apple TV 2G: AppleTV2,1_4.2_8C150_Custom_Restore.ipsw

    iOS 4.2.1 custom IPSW for iPhone 4 (Activated):
    iOS 4.2.1 custom IPSW for iPhone 4 (Un-Activated):
    iOS 4.2.1 custom IPSW for iPhone 3GS (Activated):
    iOS 4.2.1 custom IPSW for iPhone 3GS (Un-Activated):
    iOS 4.2.1 custom IPSW for iPhone 3G (Activated)**:
    iOS 4.2.1 custom IPSW for iPhone 3G (Activated)*:
    iOS 4.2.1 custom IPSW for iPhone 3G (Un-Activated)**:
    iOS 4.2.1 custom IPSW for iPhone 3G (Un-Activated)*:
    iOS 4.2.1 custom IPSW for Verizon iPhone 4:
    iOS 4.2.1 custom IPSW for iPad:
    iOS 4.2.1 custom IPSW for iPod Touch 4G:
    iOS 4.2.1 custom IPSW for iPod Touch 3G:
    iOS 4.2.1 custom IPSW for Apple TV 2G: