A cross-platform jailbreaking, unlocking, and customizing tool for iPhones and iPod touches. Customizations include boot logos, recovery logos, and "verbose" boot. It's a standalone program that doesn't use iTunes (no custom IPSWs are involved).
Redsn0w is one of the easiest and most popular tools to jailbreak iPhone, iPad and iPod Touch developed by the iPhone Dev team.
Run file in administrator mode.
Apple Firmware 4.1-5.1.1 supported.