Gaming@NINA

Whenever I open an iso from a PS2 disc which I have (any one, the ones I try ARE on the compatibility list) it always says "Error, cannot find "bios". PCSX2 cannot run without that". SO I go to the program files folder of PCSX2, I open the folder "Bios" and there is nothing in it. I've tried reinstalling it and everything, but it still doesn't work.

Any recommendations?

You need to dump the BIOS from your Playstation 2. You cannot use PCSX2 legally without one dumped from YOUR PS2.

You can find guides to dumping it here:

Link