Can you explain how you scanned your mem card for errors (as in, what/where were the errors)? I have the same issue but Master_Goofy's option didn't work for me. Had menuhax before.
I am trying to hack Fire Emblem Warriors on my 2DS XL, I have been trying to get it to work, but I need some extra help figuring it out. I have HEX codes, and a possibly outdated plugin, but I dont know how to implement them