I am 3 days with this problem, i tried all of the tools, but nothing, i think that if iRecovery can work with the new iBoot maybe the iPhone 3GS can be putted in Normal mode and i can restore with a 3.1.3 custom firmware (because now i have 1600 error) or if iReb make a new version can work with iPhone 3GS.
In last hours i found this tool 1Clickboot thinking is the solution, but, is not, but, if you run it in cmd with -v (verbose) it displays some information that will be util for some one to find a solution, here is the link.
1ClickBoot 0.5 [Official download] ~ Boot with 1 click, no replugging! - iPod touch Fans forum
Please if any of you found the solution publish it :confused:

