Ensure your system firmware version is compatible with Update 1.2.1 (typically version 15.0.0 or higher is recommended for this specific update).
A Nintendo Switch running up-to-date Atmosphère . SPLTOON3-(USA)-NSwTcH-NSP-Update121-Ziperto.rar
A tool that supports .rar archives, like 7-Zip or WinRAR . 2. Extracting the File Ensure your system firmware version is compatible with