A few days ago we told you about an unofficial port of Blacksn0w to iOS 4.0. We also showed you how you can create a custom iOS 4.0 with unofficial PwnageTool bundles. If you are running iOS 4.0 GM on your 3Gs but still on 3.1.2 baseband ( 5.11.7 ), here is a tutorial on how to unlock it.