Ul.cfg Ps2 Editor ((install)) -

A allows users to manually edit this file — for example, to rename games, fix missing titles, or reorganize the game list without reinstalling ISOs.

Without a valid UL.CFG , your USB drive is just a collection of meaningless .ISO files renamed as UL.12345678.00 — OPL wouldn’t know what to do with them. ul.cfg ps2 editor