Sigh.
DS isn't dead? That's a surprise.
--
Anyway, I'm trying to get cheats to work. Don't worry--I googled this beforehand, but no luck.
I stole RetroGameFan's usrcheat.dat from his DAT Update pack, popped it into my 1.18 original R4 SDHC, and only the first 7 games in the list get cheats...