Since you seem to be running lr-quasi88, the bios files should be in a subfolder called quasi88 (casing is important).
Get verbose log and post it on pastebin.com, this will show what files are loaded and if there is any BIOS file related error.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first