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Few minutes ago we posted that PwnageTool 4.1 for Mac OS X is available for download; and now here we are back with full step by step guide to jailbreak iPhone 4, 3GS, 3G, iPod touch 4G, 3G on iOS 4.1 and iPad on iOS 3.2.2 using the new version of PwnageTool for Mac; hit the jump for guide.

STEP 1: Download & install the latest version of iTunes & make sure your device is not on iOS 4.1 (links at the bottom).

STEP 2: Start iTunes, connect your device to your computer via USB and sync your iPhone then back your data.

STEP 3: Start PwnageTool and select your devices (iPhone 4 used in this guide).

STEP 4: PwnageTool should automatically detect the correct iOS firmware for your device.

STEP 5: On seeing this message, hit "No" to preserve your baseband to be able to unlock.

STEP 6: PwnageTool will start creating the custom pre-jailbroken firmware for your device.
STEP 7: Follow the instructions seen on the screen to enter DFU mode as shown in the screenshot below:
STEP 8: Now, You will have to restore your iPhone to the jailbroken custom firmware by Clicking on the iPhone icon on the left sidebar of iTunes then hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” then release the alt button, Now Select the custom firmware created by PwnageTool and Let iTunes go in a bunch of steps.
STEP 9: Now, i't unlock time! In case you preserved your device's baseband, you can use our step by step guide posted here to unlock iPhone 4, 3GS, 3G using Ultrasn0w 1.0-1.

Download iTunes 10 for Windows & Mac
Download iOS 4.1 for iPhone, iPod touch & iPad
Download PwnageTool 4.1 for Mac OS X