Well, SD cards can get damaged or faulty out of nowhere.
Are you running this game off the SD card, or do you have a cartridge? Did you install any updates or start using any plugins?
NSMB2 is known to cause a very specific bug, but not quite...
Hi, just wanted to ask if this crash has a solution? Every time I boot up NSMB2 it crashes on startup with this error code: https://imgur.com/a/IzrvXw9
SD card isn't damaged or faulty it started out of nowhere and the 3ds is homebrewed.