If you are using homebrew tools (such as Tinfoil or DBI), you will need the specific .nsp file for the latest update (e.g., Sonic_Mania_Plus_v1.05_Update.nsp ). the legitimate update NSP file. Transfer it to your Nintendo Switch via SD card or USB. Install the update using your preferred package installer.
Here’s a clean, reliable breakdown for on Nintendo Switch – focusing on the NSP + Update situation. Sonic Mania Plus Switch NSP UPDATE
When a system processes a game update, it doesn't modify the original base NSP file. Instead, the Switch operating system installs the update NSP into a separate directory (either on the system storage or the MicroSD card). If you are using homebrew tools (such as
Resolution of issues with audio desync, character glitching, and soft-locks in special stages. and soft-locks in special stages.