Is there a guide for converting textures meant for Citra to 3DS hardware?

[Materia_tofu]

I've been searching for a guide that explains how to convert custom textures meant for citra (Typically .PNG) for real hardware on 3DS
It's been pretty difficult trying to find one, i'm mainly trying to find out because i prefer to play mods on real hardware
rahter than on a pc, if anyone could help out that'd be awesome, thx in advance!

edit: forgot to mention im doing this for oot3d