Assuming you have verified that this file matches your hardware, here are three reliable methods to flash it.
If your bios mpr-17933.bin is, for example, exactly 8,388,608 bytes, you are likely dealing with an 8Mb (megabit) or 8MB (megabyte) chip—common for older Intel Core 2 Duo or first-gen Core i systems.
Accessing Batocera's drive to add files. Adding BIOS files. List of BIOS files that are suitable. * Adding ROMs. Batocera.linux - Wiki Saturn not loading | Recalbox Forum