Last day, the iOS 4.2 beta 2 firmware was released by Apple. Now the PwnageTool Bundle to jailbreak iPhone 3GS iOS 4.2 beta 2 have been released by msft.guy. Only in the old bootrom iPhone 3GS, this jailbreak will work. This PwnageTool Bundle could be used along with an available PwnageTool version to jailbreak iPhone 3GS 4.2 beta 2 iOS.
NOTE: You should do this process at your own risk. We are not responsible for any damage of your phone. So do this carefully.
1. Download PwnageTool Bundle from here.
2. Download iOS 4.2 Beta 2 from here.
3. Now follow the guide given here to jailbreak iPhone 3GS iOS 4.2 beta 2 (exclude steps 2 and 4). Also, since Cydia isn’t available for iOS 4.2, you will have to install the patched versions of Cydia and MobileSubstrate given here yourself.
Stay tuned to Tips Needed for more updates on the topic.