Use tools like Tinfoil or Gold Leaf to install the update NSP directly from your SD card.
Must be installed on top of the base game to work. How to Install the Update Neon White Switch NSP [Update] (eShop)
If you prefer using a PC, NS USB Loader can push the update file from your computer to the Switch via a USB-C cable. Game Overview Use tools like Tinfoil or Gold Leaf to
Refining frame rates during intense demon-slaying sequences. Neon White Switch NSP [Update] (eShop)
For users with a modified Switch, there are several reliable ways to apply the latest Neon White update: