NEO GEO Emulator on PSP Slim

I've got the current version of MVSPSP but I can't get the roms to run. It says that the bios file can't be found. Can someone please give me a step by step tut on getting this to work? And don't tell me to google it or search it please, I've already tried and have only found guides for neogeo cd. Thanks!

i've tried several times to get a Neogeo emulator running to play Metal slug, even after i get the Bios file, it still wont ever seem to work
i have no clue what to tell you

I have looked for one as well but no luck. But I do have a NeoCD one as well.

Mine runs fine. Where are you guys putting the Neo Geo BIOS file?

I have more of a problem with MAME4ALL. Even the games that supposedly work for it don't seem to. I keep getting this notice that some files cannot be found or something (and I'm not even trying to play games that require BIOS like Neo Geo as far as I know)