Psx cores not working running 7.1.1 iOS

Can’t seem to get any psx game to run on my retroarch at all it either says error loading or just crashes. I’ve added all the bios files and renamed them and have them in the right spot I just can’t get any of my games to work. Any one have any idea? Maybe my cores are out dated? How can I easily update them?

Which retroarch are you running?