So i have had a 3ds since forever but got the Monster hunter one that came out with the extra joystick ive never messed with the systems files or anything aside from moving stuff from 3ds to 3ds. I want to put custom themes on my 3ds but dont wanna brick it or anything like that either or even loose my data which has happened before due to incorrect transfer issue so i wanna know is there a way to put a custom theme thru an app on the sd card or anything that doesnt require say cubic ninja or anything like that and how safe is it
