Help figuring out what kind of mod I have?

So I picked up an used fat PS2, SCHP-50004 (PAL). It came with a bunch of backup PS2 and PS1 discs, so I figured it must be modded, which it seems to be, but I have no idea how. It plays legit PS2 DVD games and backup PS2 games, both CD and DVD. WIth Legit PS2 CD games, DVD movies, legit, import or backup PS1 games all fail to boot, the screen fades to black and goes right back to the browser. For legit PS2 CD games it says they arent a supported format.

The system itself seems to be all...

Help figuring out what kind of mod I have?