For the uninitiated, stands for Nintendo Submission Package . It is the digital file format used by the Nintendo eShop. Unlike XCI (cartridge dumps), NSP files represent downloadable versions of games.
Modifying game files through external NSP updates carries inherent operational risks that users must navigate carefully. nikoderiko the magical world nspupdate 101
Hover over the icon on your home screen. Press the + or - button on your Joy-Con controller. Select Software Update from the menu. For the uninitiated, stands for Nintendo Submission Package