An (Nintendo Submission Package) is the file format used for digital titles distributed via the Nintendo eShop. On a standard, unmodified console, these files are encrypted and signed with a unique key that must be verified by the system before software runs. To install or use an NSP outside of the official eShop, a console must be running custom firmware (CFW) like Atmosphere to bypass these checks.
The Ultimate Guide to Patched YouTube NSPs on Nintendo Switch Patched Youtube Nsp
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