A "soft-mod" memory card required to boot these homebrew programs on most Step-by-Step Setup Guide
Do not download random "USB Extreme.exe" files from torrent sites. Many contain viruses. Stick to known homebrew repositories like PS2-Home or GitHub . Download Usb Extreme Ps2 Slim
However, if you want flawless performance for action games, racing games, or anything with video cutscenes, skip USB and use with the same OPL software. A "soft-mod" memory card required to boot these