This happend to me too I fixed it by doing this read all this from pg 160-164https://gbatemp.net/threads/simple-guide-to-downgrading-your-3ds.407888/page-160
@Xdqwerty you are not dumb or stupid, you need to stop saying that, you are very smart, even about alot of things I have no clue about. We all love you here, like a big family.