i get the "garbaged" upper screen too, it seems when you start a new game that for me every other intro screen there are 2 screens where the graphics are corrupt, you can make out some outlines but the rest is very noisy . (ds lite with m3pro cf + passcard) using v32b of the m3 game manager.
i just completed chapter 1 following the bottom flashing icons as you cant read the tutorial text.
it also happens to me if you play continuous mode.
ive tried normal 1x, safe mode, normal 1x + force rw....just trying the other methods now.
so far though its a great game
I also get severely corrupted graphics on the top screen.
I'm using an M3 Lite MicroSD cart with the latest updates and M3 Game Manager v32.
Normal Mode, Safe Mode, Normal Mode + Force R/W all give the same result. No trim and no in-game reset.
Too bad, this looks like a great title.