iPhone Dev Team has just released PwnageTool 4.2 to untethered jailbreak for iOS 4.2.1 with the help of Greenpois0n exploit. PwnageTool is a Mac OS X tool, this version support all iOS devices except iPod touch 2G.
Supported device:
- iPhone3G
- iPhone3GS
- iPhone4
- iPhone4-Verizon
- iPod touch 3G
- iPod touch 4G
- iPad
- AppleTV 2G
Important note: If you rely on ultrasn0w unlock, you MUST use this version of PwnageTool which creates custom 4.2.1 firmware with preserving the unlockable baseband to be able to unlock your iPhone again using ultrasn0w 1.2
You can jailbreak your iOS device running iOS 4.2.1 using PwnageTool 4.2 by following our previous guide posted here.
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.
Note: In the above guide you Must use PwnageTool 4.2 and select iOS 4.2.1 IPSW.
Download PwnageTool 4.2 for Mac
Download iOS 4.2.1 for all iPhone, iPod touch, iPad and Apple TV 2G
Direct download links for iOS 4.2 (Official):
Download iTunes 10.1 for Windows and Mac
Download .NET Framework 3.5 (required to run Sn0wbreeze)
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