PwnageTool 3.1.3 is out! This latest version of PwnageTool updates the firmware to 3.1 on iPhone 3GS but preserves the older Modem version (Baseband) to 04.26.08 so that it can be unlocked using ultrasn0w and can be used with any carrier SIM.
The following step-by-step tutorial/guide will help you in running fully unlocked and jailbroken iPhone 3GS with iPhone firmware 3.1 on a Windows PC without having to wait for Windows version of PwnageTool or redsn0w.
The infamous iPhone Dev-Team has finally managed to jailbreak iPhone 3GS running on iPhone firmware 3.1. A member from the Dev-Team confirmed the news by posting an update on twitter confirming the jailbreak as successful.