Ah, thanks for the info. Well, it is a clone of the original, R4 Revolution for DS, with "www.r4ds.com" on the box. It was the best R4 clone I could find and it's supposed to be good.
I saw a forum topic somewhere where somebody wrote that (I believe it was Wood?) stopped being able to boot after they attempted to create a WarioWare DIY save. They had to reinstall the OS. It wasn't confirmed, however, that creating the save file is what caused the issue, and I don't know what hardware was being used, but it was speculated that lack of free space caused the data corruption.