Copy the Super Mario Odyssey update NSP file into this folder.
Select (or NAND, matching your base game location). super mario odyssey switch nsp update install
Your Switch must be running a custom firmware, with Atmosphere being the most common and widely supported today. More importantly, you must have the correct installed. Sigpatches are essential as they allow your CFW to bypass Nintendo's signature checks, enabling it to run unofficial software and install NSP files. Outdated or missing sigpatches are the single most common cause of installation errors. The latest patches can be found on trusted sources like the "ITotalJustice/patches" repository. Copy the Super Mario Odyssey update NSP file
To update Super Mario Odyssey using NSP, you will need: you will need: