Yeah, they certainly didn't test it properly lol
I didn't need it, I was just curious. It's back in the box now, I'll check it out again when they next fw comes, if it comes. It's worse than my DSTwo, R4i Gold 3DS and even worse than my Acekard 2i lol All of those play Dawn of Sorrow FMV perfectly.
I'm getting stutter in Meteos when cycle through the menu screens as well, I remember that happening on really old carts as well. I guess this is good if you're nostalgic and want to experience what bad flash carts from 15+ years ago were like