Back in the day, I tried to use my old original R4, in the O3DS. It didn't work, as I posted here.
Now I have a N3DS, and I tried again in A9LH Luma 6.3.1 and 11.1.0. Same problems as before. I can install DSiWare without problems, and the DevMenu detects when I put in the R4, changing from "No...