This usually means you downloaded a "Merged" set or a rom from a different MAME version (like 0.37b5). Ensure your source specifically mentions 0.139u1.
Below is a complete guide to understanding, finding, and installing these classic arcade files. 🕹️ Understanding MAME4droid 0.139u1 mame4droid 0.139u1 roms archive.org
The "0.139u1" designation refers to a specific version of the MAME (Multiple Arcade Machine Emulator) core. In the world of emulation, romsets must match the emulator version exactly. If you try to run a newer romset on MAME4droid 0.139u1, you will likely encounter "Missing Files" errors because the way arcade boards are dumped and organized changes over time. Why Use Archive.org for ROMs? This usually means you downloaded a "Merged" set
These files are preserved for historical purposes, meaning links rarely go dead. How to Find and Download the Set 🕹️ Understanding MAME4droid 0