Possible steps to explain include using official Nintendo tools or, if they're using homebrew, the process might involve extracting NSP, updating using hactool, and injecting back via hactool, but again, this is for homebrew use only and isn't sanctioned by Nintendo.
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No. A stock Switch cannot install NSP files. You need a modchip or a software-modifiable console (only early 2018 models). Possible steps to explain include using official Nintendo
