How to Jailbreak Your iPhone 3GS Using PwnageTool (Mac) [4.2.1]

Here are the instructions that has to be followed in-order to jailbreak your iPhone 3GS on iOS 4.2.1 while working on PwnageTool for Mac.

Step 1.
Here, in-order to follow this steps, you are require to have 4.2.1 iPhone firmware.
4.2.1 (3GS): iPhone2,1_4.2.1_8C148a_Restore.ipsw

Step 2.
Now you double click to run PwnageTool and then drag the PwnageTool icon into the Pwnage folder.

Then from the Pwnage folder double click to launch the PwnageTool application.

Step 3.
Now tap to choose Expert Mode from the top menu bar

Step 4.</strong
Now click to choose your device.

Step 5.
You will be brought to the “Browse for IPSW” page. Click the Browse for IPSW… button.

From the popup window select your firmware from the Pwnage folder then click the Open button.

Step 6.
You will then be brought to a menu with several choices. Click to select General then click the blue arrow button.

The General settings allows you to decide the partition size. Check Activate the phone if you are not with an official carrier then click the blue arrow button.

The Cydia settings menu allows you to create custom packages so you do not have to manually install the necessary them later.

Click to select the Download packages tab. Then click the Refresh button to display all the available packages. Double clicking the package you want will download it and make it available in the Select Packages tab and checkmark the ones you want then click the blue arrow button.

The Custom Packages Settings menu displays listed package settings for your custom IPSW. For know leave these settings as is. Click the blue arrow button to continue

Step 7.
You are now ready to begin the pwnage process! Click the Build button to select it then click the Blue arrow button to begin.

Step 8.
You will be asked to save your custom .ipsw file. Save it to your Pwnage folder you created on your Desktop

Your IPSW is now being built. Please allow up to 10 minutes.

You will be asked to enter your administrator password.

Step 9.
Once your ipsw has been built you will be asked to connect your iPhone to the computer. Once it detects your device PwnageTool will guide your through the steps to putting your iPhone into DFU mode.

Note: How to Put an iPhone Into DFU Mode refer the previous tutorial

Once your iPhone is successfully in DFU mode, PwnageTool will prompt you to launch iTunes.

Step 9.
Once In iTunes, hold the Alt/Option key and click Restore.

Step 10
Once In iTunes, hold the Alt/Option key and click Restore.

Step 11.
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 12.
iTunes will now restore the firmware on your iPhone. This can also take up to 10 minutes. Once done you will be rebooted into jailbroken iOS 4.2.1

[Via] http://www.iclarified.com

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