Bios help "failed to load content"

I am having trouble with bios based emulators. I have the games scanned and bios in the directory, but when I try to open them, it says “failed to load content”. Sorry, but im really new at RetroArch. Any help would be appricataed!

When you load the core but before you load any games, go to main menu > information > core information and it will tell you which BIOS images it wants, the name it’s looking for (your files need to match that name exactly) and the MD5 checksum of the working BIOS image(s).

Thanks! This is really helpful!