maybe you bricked it? i'm not all that experienced with the 3DS at the moment as all i know how to do is homebrew a 3DS, install CIAs and download new homebrew. oh, and update Luma3DS. actually, is that a thing you tried? if not, then try it!
@SylverReZ, the reason I changed my pfp only to change it again a day later is bc that while i find Kagura from gintama likeable and funny i think i relate more to lidelle from puyo puyo