Copy all the extracted BIOS files and subfolders directly into the root of this bios folder. Do not create a new subfolder named "Full Bios Pack"—the files must sit directly inside the main bios directory. How to Verify Your BIOS Files are Working
While convenient, downloading a random "full BIOS pack" from an unknown source is risky. Many contain outdated, misnamed, or malicious files. full bios batocera link