If you own the game via the eShop or physical retail cartridge: Hover over the Pikmin 4 icon on your Switch Home Screen.
By following this guide, you can ensure your Pikmin 4 experience is always up to date, whether you are using the official eShop version or managing backups. pikmin 4 switch nsp xci update eshop install
They often look for ways to install or unsigned code on a modified Switch. This requires: If you own the game via the eShop