All my games are on micro and with .3ds format, and my sd card is only 16GB to embed emunand with latest 11.17 fw + homebrews.Use Luma, and a SD card, that's all you need. I tested the thing in an old 3DS, an old 2DS and a HD 2DS.
I will give it a try.
But are there luma modules necessary to let it work ? As red viper was successfully installed and I have DSP firmware, I am surprised that it doesn't work, even with Gateway.