I have updated BIOS in several computers, this one is extremely buggy.
This is what I did so far.
Installed FreeDOS from unetbootin to USB stick.
Copied files in there too.
Started computer from Stick, FreeDOS in safe mode (no drivers loaded), only option that would work.
In fact it is recommended to not load any additional drivers, just the DOS prompt.
Navigated to d: (my stick), dir found the BIOS files, so started the executable.
Started, 10% loaded, freeze, freeze, freeze, did not get to the point to flash BIOS, luckily.
It nearly destroyed computer.
Nothing loads correctly, not even Gparted live, Kill Disk, etc.
I am now re-installing Debian testing (wheezy) from businesscard.iso CD, Debian seems to manage this damn computer.
Basically, I need to make a DOS CD where I can also put the BIOS, a real DOS CD, because the DOS prompt will not see the BIOS in the USB stick.
Or, a real DOS boot stick, where I can also put files, although at this point I am not sure that DOS can manage this damn thing.
My last resort would be to completely hose drive, install Windoze, flash from there, then hose again, install Debian.
But I am stubborn, there must a solution along the guidelines above.
BTW, the link to DOS image in previous post is dead.