Ok, I figured it out. It was the kyra.dat file from the ds package that I had to use.

Hello ScummVM forum members and fellow adventure game fans, I have got a little problem getting Legend of Kyrandia running on my DS. It does not give me an error but the screen just goes black (the DS remains on though) when I try to run it. I have tried the necessary files from the ENG/1 folder as ...