Instead of searching for random "full bios" links that might be outdated or contain malware, use the native Missing BIOS Check tool: Open the Main Menu by pressing [Start]. Navigate to Game Settings > Missing BIOS.
These files were the ghosts in the machine. They were the keys that unlocked the doors to the polygon past. full bios batocera link
External USB: Plug a USB drive into your Batocera machine and use the built-in File Manager (Press [F1] on a keyboard) to copy files from the USB to the internal /userdata/bios/ folder. Instead of searching for random "full bios" links
Select Missing BIOS. This menu will list exactly which files are required for specific emulators and whether they are currently detected. full bios batocera link