Mame 0.139u1 Bios Pack ((link)) Official

Ensure your BIOS files are specifically from the 0.139u1 set. If you use BIOS files from a newer version (like 0.250), the "checksums" won't match, and the emulator will reject them. 3. Folder Directory Move the BIOS zips to /SDCard/MAME4all/roms .

Some BIOS files dictate whether a game runs in English, Japanese, or European modes. Mame 0.139u1 Bios Pack

Required for all SNK games like Metal Slug and The King of Fighters . Ensure your BIOS files are specifically from the 0

Some games require a "Parent" ROM to be in the same folder as the "Clone" or the BIOS. Always keep your full BIOS pack in the main ROM directory. the "checksums" won't match