Open your chosen installer (e.g., ) on the Switch and select the "Run MTP Responder" option.
Warning: Modifying Switch firmware, installing unsigned ROMs/NSPs, or using pirated Update/DLC files can permanently brick your console, void warranties, and may be illegal in your jurisdiction. This article is for informational and technical-education purposes only.
You want .nsp or .xci files. For updates, look for .nsp files labeled UPD (e.g., Tools Up UPD v1.2.0.nsp ). For DLC, look for DLC in the filename.