I can’t get this to work on fba-next. I’m able to get into the service menu by pressing R3 on the joystick. I then change my settings, save and exit the service menu at which point the game continues.
I can see that a .nv file has been created in the same folder where the rom is located. However, when I quit the game and relaunch, it doesn’t seem to load the .nv file and the settings have returned to default.
I tried checking the core-options but didn’t see anything about saving dip switches. I tried saving the game configuration file in the core options but that had no affect.