Yesterday, we reported the news of the release of the Sn0wbreeze 1.7 version and we also posted a guide on how to jailbreak the iPod Touch 2G (MC Model also) on iOS 4 with the Sn0wbreeze 1.7 version. Now here is a guide to jailbreak iOS 4 on iPhone 3GS (New Bootrom also) on Windows with Sn0wbreeze 1.7.
1. Download Sn0wbreeze 1.7.
2. Download the iOS 4 firmware for iPhone 3GS.
3. Now follow the steps posted here to Jailbreak iPhone 3GS (New Bootrom also) on iOS 4 with Sn0wbreeze 1.7.
After that, you will have a completely jailbroken iPhone 3GS in your hands.