Só i've read several reports of other users that were using 2.6 with emunand without issues and tried to troubleshoot on my end.
What I've noticed is that if I boot to sx os menu and try to boot from there Emunand I get the black screen error, but if I boot directly to emunand from payload it...
Looks like it, it's late in the evening where i live, so i won't mess with it anymore, just gonna put it on the dock and see if SX fix this mess by next weekend.
Hey man, i figured out that went wrong with mine, i've installed the O3DS pack on N3DS, your's looks just like mine, can you check that you have downloaded the right pack?