Snowbreeze 1.6.2 has been released to fix the certain errors which you can face if you have jail-broken your iPhone / iPod on iOS 4. This update brings fixes for Youtube, iBooks and iTunes restore errors.
Another new feature in this version is that it now supports old bootrom Spirit’d devices. Sn0w breeze 1.6.2 can jailbreak iPhone 3GS (old botroom), iPhone 3G and iPod Touch 2G on iOS 4 for windows users. It is like PwnageTool for Mac users to create custom pwned ipsw firmware files which can be restored on iDevices without changing the baseband.
Here is the step by step procedure to jailbreak your device with Sn0wbreeze. After jailbreak you can unlock iPhone/iPod with Ultrasn0w 0.93 (guide is here).
Download Sn0wbreeze V1.6.2 for Windows
Download iTunes 9.2 for windows and Mac
Download iOS 4 original Firmware Files
Download .NET Framework 2.0 (Needed to Launch Sn0wbreeze)