Okay, awesome, thanks for helping to clear that up. Also, I got mine to work with a specified bios on the most recent version. Here’s a write-up:
Create the directory to store BIOS files:
Make sure you copy your bios files into that directory with no capitalization in any part of the name or file extension.
Next, edit the file:
and add the line:
system_directory = /home/pi/RetroPie/BIOS
Thank should do it. If anything doesn’t work with that solution, holler down below.