The PS2 modding scene offers alternatives, but each has a fatal flaw.
Your USB drive is prepared, but the software on the PS2 must be optimized. If you use OPL (version 1.1.0 or later), apply these settings for maximum compatibility: Usbutil 3.0 Ps2
(often referred to simply as USBUtil) is a free, Windows-based software utility designed specifically for the Sony PlayStation 2 (PS2) homebrew and backup loading scene. Its primary function is to prepare, format, and manage USB storage devices (flash drives, external hard drives) to run PS2 game backups via USB loading methods such as Open PS2 Loader (OPL) . The PS2 modding scene offers alternatives, but each