Now I’m not sure if this si a Lakka.TV issue or a general Retroarch issue. By default RetroArch seems to want to use the Mednafen core for PSX; which refuses to load any CUE/BIN files I manually told Retroarch to load the PCSX-ReARmed core then then load an ISO and that at least loads. But I cannot work out how to change the ‘default’ core for PSX?