Here are all things you need, for dumping your BIOS:
If you have a working USB-Stick:
Burn it with a system.cnf on cd or run it from uLaunchELF v4.11
(It works for Slim, I had really problems finding files, which are working with PS2slim...)
Try dumping both formats, maybe you'll need it some day... You'll need just the first package for this,
If you don't have a working USB-Stick:
You can do it also over the FTP-Network, but thats a bit complicated (not for freaks like me

) to get something
like this to work (Networkdrivers of PS2 are still buggy), if you want doing it, you need all packages.
Run PS2Link from your PS2 via CD (you need a system.cnf) or uLaunchELF v4.11 and run xlink from your PC;
and drag&drop the Biosdumper-elf-file, now you have to wait a bit; if it takes to much time, than the network crashed-> restart your PS2 and try again (you can also try to skip files, where the network crashes)
For the PS2 I used following IP-Settings: 10.10.10.98 255.255.255.0 10.10.10.1 # EXTRACNF = mc0:extra.cnf; (IP-Gateway-DNS)
Do it similar with your PC and you don't have to edit the ipconfig.dat
rgds GothicIII