The iPhone Dev Team has just released official version of PwnageTool 4.2 which incorporates the new kernel based exploit of GreenPois0n for creating full untethered iOS 4.2.1 custom firmware files. Almost all iOS devices are supported except for iPod touch 2G.
List of supported devices by PwnageTool 4.2 includes:
- iPhone 3G
- iPhone 3GS
- iPhone 4
- iPhone 4 Verizon
- iPod touch 3G
- iPod touch 4G
- Apple TV 2G
When to use PwnageTool over GreenPois0n? If your iPhone relies on a carrier unlock, YOU MUST use this version of PwnageTool to create custom 4.2.1 firmware files without the upgraded baseband so that you can unlock your phone on the old baseband using Ultrasn0w 1.2.
Instructions for jailbreaking using PwnageTool are similar to the last release, simply follow them as posted here. Select iOS 4.2.1 IPSW file where required.
UPDATE 1: Our step by step video guide is now up!