Welp, so I just found something weird. I have 2 jap new 3DS, one black and one white (mine and my wife), both are in 9.0.2-20J
I did the procedure on my new 3DS (black), everything went smooth and worked on the first try.
Now I've tried to do the same to the white new 3DS, but every time I run the exploit from system settings, it just crashes, like the old times when we forgot to copy the launcher.dat file into the 3DS SD card. Weird, because I can use that SD card to access emunand via Cubic Ninja without problems, but if I try to launch the emunand from DS Profile, it crashes. Both the emuNAND-less microSD used for installing the mset.cia file in both consoles, and her regular microSD with her old region switched emuNAND. I've instaled NVRAM plenty of times, but it just refuses to work and only run if I use Cubic Ninja.
Any ideas?