https://iphoneroot.com/howto-untether-jailbreak-unlock-iphone-3gs-redsn0w-096rc9-windows-ios431/
Step-by-step Tutorial: How to Untether Jailbreak and Unlock Your iPhone 3GS Using RedSn0w 0.9.6rc9...
This is step-by-step instructions on how to perform untethered jailbreak and unlock for your iPhone 3GS on iOS 4.3.1 firmware using RedSn0w 0.9.6rc9 for