Asus P5B SPI flash challenges

Well, following the web's advice on how to revive my disabled Asus P5B mainboard after a gone-very-wrong bios flash attempt out of windows vista 64 i am making progress with recovery. Thanks to mondotech i at least have a rough idea on what to do.

So i finally managed to have a friend create a working cable for me as i am not the soldering guy. Seeing the spipgm tool recognizing the attached spi did get me excited, but unfortunately the board stays dead after multiple "successfull" flash attempts. So out of pure curiosity i used the spipgm tool to download the bios file that is in the chip and write it into a file. Guess what, it does differ from the one i used to flash the chip. I failed back to the P5B.ROM provided on the cd that came with the board, but still, no luck. Downloading the file with spipgm from the board i get a "corrupt" file that differs from the one delivered on the CD:


I used the tool "Fairdell HexCmp" which is avaliable as a 14 day trial over at the fairdell webpage. So how can i overcome this issue? Does it mean my board is seriously damaged? Or is it simple bad timing / bad wiring / user error during the flash process? We'll see.