Take that poster to Abner in Hypno Baron’s Castle; he will give you a different, "sucky-looking" poster.
Use a homebrew application like Tinfoil or Goldleaf to install the update to your Switch. shantae halfgenie hero nspupdate 105rar
Here is a post template focusing on the game and the features typically associated with that update version: Take that poster to Abner in Hypno Baron’s