I finally got the exploit onto my memory card when I remembered I could no longer boot PSX games. For the record, I can still boot both DVD and CD PS2 games so I don't think the problem is a dirty laser.

Has anyone had this problem? I've tried vacuuming the PS2 and diagnostic mode, no luck. So I'm coming to you guys for advice. Thanks in advance.

I've got a SCPH-30001 model if it matters.