Check all this, and if it still doesn't work, please report:
None ROM works? yes some work.
Or are you just trying with 1 specific game? no.
Only MAME doesn't work? no snes, n64 both work but i’m just trying to get mame to work.
You say that MAME works, but you don't make it clear if the ROMS are recognized or not, you don't even say if there is an error or if it crashes or what happens, make it clearer and if an error appears, describe it or attach it prints. yes the roms are listed well most of them. the error is it just restarts itself after choosing a game.
i d/led the roms off a Torrent site and got it from a retro ROM website. they said it was .160 or 2015. they are a complete non-merge set. as for resetting it and delete all the configurations I only edited recalbox.conf by adding 2 lines and creating the two overload files.
Also in the instructions it says you can have different romsets if you put them in different folders. that’s what I was going to do. I have romset .220 also with half the .chd files i would rather use but there’s not even a core for it. I’ll have to get it if it’s even available.
I will look at your directions and use the program Romulus and see what I have then get back to you. thanks for the help.