You are likely booting the game in DS mode on TWiLight.Every time I boot the forwarder I created for Fire Emblem Heroes of Light and Shadow I get the bellow message. Any way to stop this message popping up? The message doesn't show if I boot the rom from twighlight menu so not sure what is happening.
View attachment 329909
You can do the same here, by pressing Y while booting the forwarder. I'd recommend getting a clean dump, though, preferably from a real cartridge because the only reason you see this is because of a pirated ROM.