OK, well I tried the homebrew method. It started with soldering a socket to a small board, and soldering that to the corresponding points on the xbox (im sure you have the page with the instructions). I was flashing a BIOS chip with the Xtender 1.1 code, which did not work in a couple of older PC's, so I used my 1.4ghz to do it. It flashed the chip "successfully" and verified fine, though when putting it in my XBOX I would get a green solid light, no video, and the DVD-Rom would buzz and vibrate, and would not open. I have flashed the chip many many times over and over, and also flashed it with the original MS Xbox BIOS, which still did nothing. Personally, I think the whole "flash-with-your-motherboard" method is a hoax, as I have heard nothing but problems with it. Excuses given to me were "your motherboard/system is not good enough". How friggin' high-tech does your PC have to be to flash a f&&*(@# 256 little BIOS chip?? I have ordered a regular EPROM from someone to get an answer once and for all.
For those out there who want to do this homebrew shit: Don't waste your time (with the flashing of the chip, anyway). I have gotten no support from anyone except to check my solder points, which test perfectly with a meter. I can only re-check the points so many times. I guess its too new of a thing for anyone to really know whats going on. Blah. The end.