empty black screen on mario kart ds

this may be a bit too old and too late question. i always get a black everytime the third course tries to load in the lightning cup of the retro grand prix. i'm using an acekard 2i. i already tried everything i know - enable AP, disable soft reset...can anyone assist me on this?

Back up and format your MicroSD card.

i've already done that a lot of times already

Try a different ROM?