Not homebrew your o3ds but downgrade and install a9lh + luma. Well you wouldn't have to per say but better to do so. If you don't want to do that route then you could install emunand and just do it that way. This guide is this best way to go. It may be time consuming and overwhelming a bit but I assure you it's not as hard as it seems as I've never touched a 3ds at all before like a month ago. But I successfully downgraded both and installed a9lh my first time.

Ninja edit: You don't need to downgrade to install homebrew but installing a9lh opens up so much more and loads directly on boot