Demon Front works almost perfectly on lr-fba-next. I’ve been trying to run the game for months with no results, then once I switched to the raspberry pi 3 and I made a fresh new install I added to the rom folder not only the pgm bios but also the file isgsm.zip (obviously make sure you have the proper romset for the lr-fba-next) and now all the pgm games work flawlessly. Let me know if you need further help, I can understand the frustration you are going through and since I’ve been there, I’ll do whatever I can to help you lol.