Psx bios

Hi all. Very recently got my mini V4 and have updated it to the latest onionOS. But every time I load a game on PlayStation I get a message saying -No PlayStation BIOS file found - add for better compatibility. When I check the bios folder there's one there and also if I load retroarch through the application menu and load the game, that message does not appear. Any ideas what Im doing wrong?

Cheers all