So.. I updated my old 3ds to b9s and used it for a bit and removed sd and everything still worked fine. So I thought let's try it on my new 3ds xl. I do it. Everything seemed fine for it so without testing to see if it still works without it, I deleted the files in the sd card to use it on another device. Later finding out it just blinks the led then off when hitting the button. I know what's wrong, I just don't know how to get the files back needed for boot. If someone can help that would be amazing.