Technically, you should dump the BIOS from your own physical PS2 console to remain legal.
: Clearly list the required BIOS region (NTSC-U, PAL, or NTSC-J) to avoid common "format disc" or region-lock errors. Why This Matters Reduced Friction
Use Romspurecc or similar archives only for titles that are:
The emulator will automatically scan the folder and display your games in the main menu. 3. Playing on Original Hardware