iH8Sn0w released Sn0wBreeze 2.9.4 with the ability to perform an untethered jailbreak of A4 devices on iOS 5.1.1. Sn0wbreeze can be used to create a custom firmware with jailbreak and preserve iPhone modem (baseband) version for unlock.
Sn0wbreeze 2.9.4 supports iPhone 3GS,
You can download Sn0wBreeze 2.9.4 from
Our step-by-step tutorials for Sn0wBreeze 2.9.5 are available here: