Have you tried installing just luma with the latest boot firm on another sd card to see if thats the problem? Also if you have cfw rosalina in the 3ds it should be fine to update it to the latest version as long as you use the latest luna boot.firm
Only thing drive me crazy is all these new horror games nowadays is its so dark, all time. I can't even play them. I understand they trying to create spooky but be creative a little, not just darkness with pop out scare scenes.