I can give you more tailored setup steps if you let me know!

: This is a binary copy of that system software, which emulators like PCSX2 require to mimic the behavior of a physical PS2. The Legal Context

Run a tool like "PS2 BIOS Dumper" via a USB drive on your console.

I notice you’ve mentioned a specific filename: scph-70004-bios-v12-eur-200.bin . This appears to be a BIOS file for the PlayStation 2 (model SCPH-70004, European version, BIOS v12).