1. You want instructions to apply an official or fan-made NSP update file to a Nintendo Switch game (installation/patching).
  2. You want a detailed changelog summary or explanation of what an NSP update does (what files it replaces, what bugs it fixes).
  3. You want a compatibility/technical guide for using an NSP update with custom firmware (CFW) on Switch.
  4. You want help creating or packaging an NSP update (building an update NSP from patched files).
  5. You mean something else — e.g., an in-game "update" or mod details.

Conclusion

Update (UPD)

The main issue isn't usually the base NSP; it is the file itself. Monster Boy received several major overhauls (v1.0.5, v1.0.7, and the final v1.1.0). If you mix a base game dump from 2019 with a v1.1.0 update, the Switch often crashes or fails to boot.

Reset Required Version

: If the game still asks for an update after you've installed one, use DBI to "Reset Required Version" to stop the nagging popup. Key Update Details

The game's art style is vibrant and colorful, with detailed environments and character designs. The animations are smooth, and the transformations between human and monster forms are visually appealing. The soundtrack, composed by Axel St. Julien, complements the game's atmosphere with catchy and upbeat tunes.