Guys, It worked for me on iPhone 3G and iPhone 3GS old bootroom not new
So just wait for Redsn0w, Sn0wbreeze, or PwnageTool update their tool to jailbreak 3gs new bootroom!
For all GSM-Forum, there's a good tool that will enable you to jailbreak and unlock your device, check:
ToolJail 2.2: Helps you to Jailbreak & Unlock iOS 4 on iPhone and iPod Touch
i got error 17 when update iphone 3gs week 33 (from serial number 4th and 5th number) with model MC from 3.1.3 modem 5.11.01 to sn0wbreeze custom 4.0. can't update it with sn0wbreeze. why?
maybe it depends on which jailbreak software i use?