The result will be your existing PwnageTool jailbreak will work with the latest firmware. Remember, this is only for jailbreaken iPhone 3G using old bootrom. In case you are with new bootrom this one not for you, better be waiting for the release of GreenPoison tool that is expected in the near future.
Requirements before proceeding :
- Surely owning iPhone 3G with old iBoot and have it unlocked using PwnageTool
- Pwnage Tool 3.1.5 Download here
- iPhone 3G iOS 4 GM Bundle Download Here
In case you want to jailbreak iOS 4.1 for iPhone 3G.