iH8sn0w just released Sn0wbreeze 2.7.1 for Windows, which allows users who want to jailbreak and also unlock their iPhone to update their iPhone with a pre-jailbroken iOS 4.3.3 while preserving the baseband from getting upgraded so that it can be unlocked using Ultrasn0w.
This guide will provide iPhone 4 and iPhone 3GS users with step-by-step instructions to update and jailbreak their iPhone with iOS 4.3.3 while preserving their iPhone’s baseband.