Ah. The problem now is that the games on it were almost all actual eShop games that I don't have cia's for, and it looks like I can't redownload them from the eShop anymore after formatting. I tried using Shameless to get back one of them (smash), but it redownloaded the whole thing, and my save file is gone.
Edit: And even after installing some tickets that way, the eShop shows nothing in the "redownloadable software" list and nothing in the "installed software" either, even though Smash is installed.
Oddly enough, after the format, Zelda: Four Swords instantly appeared without me installing or downloading anything, and the save file for that still works.