Searching "Batocera BIOS Pack" on the Internet Archive often yields user-curated packs.
Avoid YouTube links or password-protected zip files claiming to be “batocera bios pack v35 hot.” Many contain malware or outdated files. Stick to curated GitHub repositories and trusted archive dumps (look for SHA-1 checksums).
After reboot, check the BIOS checker again – all critical files should now show green.
You can move these files using a USB drive or via the Batocera Built-in File Manager . Copy the extracted "bios" content onto a USB drive.