For 3DS :P
(Only if you have installed the DSI System settings and used the Data Management by accident lol)
(Warning: I will recommend to Backup your nand before doing this).
If your TWL apps (DSIWare) or NDS games don't longer boot and the Firm method didn't work, then this might help you a...
DSI XL, U, Midnight Blue Edition/Dark Blue (where the outside camara is (not the back of the buttons) (and where the screens are)) and black (the back side of the front buttons) (Has Reflection) Brain Age Math & Letters... Edition
Console ID:
First 5 Digits: 08202
The 14th number is 1
eMMC CID...
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.