https://georgepavlides.info/successful-5-0-1-untethered-jailbreak-and-unlock-of-iphone-3gs-week-43-modem-06-15-00-on-windows-7/
Successful 5.0.1 untethered jailbreak and unlock of iPhone 3GS (week 43, modem 06.15.00) on Windows 7