Today, USBExtreme refers to two specific things in the PS2 homebrew scene:

With this setup, your PS2 will live on for another decade—no discs required.

OPL uses the code to fetch game art and compatibility settings. Wrong names = game doesn't appear.

Highlight a game → Press Triangle → Adjust Modes individually.

Games that stream audio directly from disc (e.g., GTA: Vice City , Gran Turismo 4 ) often perform poorly over USB. Stick to RPGs and fighters.