Everyone now are having hard time to reflash/update their samsung galaxy s i9000 because cannot go to download mode. This video shows you on how to go to download mode even the 3 keys combination doesn't work. If you notice i modify a usb and a resistor. Any micro usb male and a resistor will work.

Here is my MODIFIED USB with Resistor



My modified USB with resistor works like a charm even your samsung galaxy 3 button key is disabled, just plug it on the USB socket of your phone and you're DONE
For upgrading your Samsung Galaxy refer to this TUTORIAL.

Heres a Video on HOW it WORKS
http://www.youtube.com/watch?v=_cdBw0OSbcA