When you store PS2 games on a USB drive or an external hard drive connected to your PS2 via USB port, the PS2 cannot read standard .iso files directly. The USB loader software requires games to be split into fragments ( .ISO.01 , .ISO.02 , etc.) for compatibility with FAT32 file systems. The ul.cfg file acts as a or file allocation table that tells OPL:
Before you start downloading UL CFG files, make sure you have the necessary requirements: ul cfg file ps2 download