iH8sn0w has released Sn0wbreeze 2.8b2 to jailbreak iOS 5 untethered on iPhone 3GS (Old BootRom). Sn0wbreeze 2.8b2 can jailbreak iPhone 3GS (old Bootrom) iOS 5 beta 1 untethered. These are the steps to jailbreak iPhone 3GS 5 with Sn0wbreeze 2.8b2.
Here is: how to check iPhone 3GS Bootrom. If you’re lucky enough to have an iPhone 3GS with Old bootrom. you can get untethered jailbreak on iOS 5 firmware using Sn0wbreeze 2.8 beta 2.
Sn0wbreeze 2.8b is already capable of jailbreaking all iDevices (except iPad 2) on iOS 5 beta, but these devices get tether jailbreak only. iPhone 3GS Old bootrom is the only device that gets untethered jailbreak.
To jailbreak iPhone 3GS old bootrom on iOS 5 untethered with Sn0wbreeze, simply follow the guide linked below. Old Bootrom 3GS users doesn’t need to follow tether boot steps with iBooty.
How to: Jailbreak iOS 5 with Sn0wbreeze
You can also jailbreak iOS 5 on iPhone, iPad and iPod Touch (except iPad 2) with RedSn0w 0.9.8 which provides tethere jailbreak on both Mac and Windows. RedSn0w jailbreak instructions for iOS 5 can be found here.
Note: iOS 5 beta is currently available to registered iOS devs only. Sn0wbreeze and RedSn0w jailbreaks are meant for those developers who want to develop/update jailbreak apps for iOS 5.