Magnavox - Odyssey2 (O2EM) - How to enable G7400/Videopac+?

Is there any trick to enable the G7400/Videopac+ Bios? :thinking:

Right now, games like “Killer Bees” (and every other title that has enhanced graphics when played on a G7400 System), only run in standard G7000 mode (using the default “o2rom.bin” bios).