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The iPhone Dev-Team has finally released PwnageTool 4.2 for Mac. You can follow these instructions, coutesy of iClarified, to achieve an untethered iOS 4.2.1 jailbreak on your iPhone 4.

Step One:

Make a folder called “Pwnage” on the desktop. Then you need to put PwnageTool 4.2 (download link 1,2) and the iOS 4.2.1 iPhone firmware in it.

Step Two:
Double click to mount PwnageTool then drag the PwnageTool icon into the Pwnage folder.

Then double click to launch the PwnageTool application

Step Three:
From the top menu bar, select Expert Mode

Step Four:
Then simply click on the images given to select your device. Once selected, click the blue arrow to proceed.

Step Five:
A “Browse for IPSW” page will be displayed. Click the Browse for IPSW… button to select the IPSW that we downloaded earlier.

A window will pop-up from where you have to select your firmware from the Pwnage folder and then click the Open button.

Step Six:
A menu displaying several choices will come up. Click to select General then click the blue arrow button to proceed.

The General settings allows you to decide the partition size. If your iPhone is not on an official carrier, Check Activate the phone and click the blue arrow button to proceed

Remember: Deselect Activate if you have an iPhone legitimately activated on an official carrier.

The Cydia settings menu lets you to create custom packages, eliminating the need to manually install them later.

Click On the Download packages tab. Click the Refresh button to display all the available packages. To download a package, double click on the one of your choice, it will automatically be downloaded and made available in the Select Packages tab.

Check the packages you want and then click the blue arrow button to proceed.

The Custom Packages Settings menu displays listed package settings for your custom IPSW. Leave these settings as they are, for now.

Step Seven:
The Pwnage process is now ready to begin! Click the Build button to select it and proceed by clicking the blue arrow button.

Step Eight:
PwnageTool will then ask you to save your custom .ipsw file. Save it to your Pwnage folder you created on your Desktop.

PwnageTool is now building your custom IPSW. The process can take up to 10 minutes so be patient.

Step Nine:
Once you custom IPSW has been built, PwnageTool will ask you to plug in your iPhone. Once it detects your device PwnageTool will guide your through the steps to putting your iPhone into DFU mode.

Follow the onscreen instructions to easily put your iPhone into DFU mode.

Step Ten:
Once your iPhone is in DFU mode, fire up iTunes and hold the Alt/Option key and click Restore.

Step Eleven:
Navigate to the Pwnage folder on your desktop using the dialog window that appears. Select the custom IPSW that was created and click the Choose button.

Step Twelve:
Sit back and relax as iTunes will now restore the custom firmware you created using PwnageTool on your iPhone. This can also take up to 10 minutes. Once the restore is done, your iPhone will be rebooted into untethered jailbroken iOS 4.2.1 !

Let us know in the comments below if you experience any issues while performing this procedure.

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