Apparently I'm on Luma3DS 6.6, and I think I'm using A9LH, though I'm not sure. https://3ds.hacks.guide/a9lh-to-b9s
I'm not even sure if I "need" the gateway, it's just what I had set it up with at the time? Seems to boot into CFW anyways and I can load a game, so it must be installed to the SD...