Emulation

No. All you need to do is put them in the right place. If they are marked as missing, either they are not in the correct folder, not named correctly or are the wrong versions.

Note: You don't need all files that are marked as missing in this list. There are bios files from PSP and PS3, but you don't need them. You only need the 3 original PS bios files, 1 for each region: scph5500.bin, scph5501.bin, scph5502.bin . Make sure they are the correct versions. Easiest way to check that is with md5sum . Then compare it to the MD5 listed at documentation link I gave you earlier, which looks like these 490f666e1afb15b7362b406ed1cea246 . Its enough to just compare the first few and last few characters to make sure its correct.

Without getting creepy (I have only good intentions) I looked up your post history to see if you were a Linux user. I can see you was setting up Batocera at some point. It is entirely possible that the system you are using setup a different directory for the RetroArch bios "system" folder. Open RetroArch and lookup Settings > Directory > "System/BIOS" . The very first entry on this list shows where the system directory of RetroArch is setup for you. The Playstation bios files go in that folder.

Can you play any Playstation games? If not, its best to create a log file. I don't know what platform you are using, here is an overview of how to do that for all platforms you have installed RetroArch on: https://docs.libretro.com/guides/generating-retroarch-logs/