Official Version 9.2.0 was released on . This specific patch was a major quality-of-life and balance update that introduced several key changes:

This is a "Nintendo Submission Package," the standard format for digital games and updates on the Switch.

Players can now "remember" and revisit the Grand Festival venue offline by tapping specific amiibo (Callie, Marie, Pearl, Marina, Shiver, Frye, or Big Man) at the amiibo box.

The update notably buffed the Splattershot and Splattershot Pro by increasing shot speed by ~3%, intending for these to act as benchmarks for future balance.

This is a compression format used to reduce file size for easier sharing.

Files labeled with "NSP.rar" found on third-party sites are often intended for modified (modded) consoles or emulators. Using these files on a standard console can lead to permanent Nintendo Account bans from online services. How to Update Officially

Improved communication processing reduced the delay when players pick up Golden Eggs by roughly 1.5/60th of a second. Understanding .NSP and .RAR Formats

The Angle Shooter received a 5% velocity boost, while the Booyah Bomb now charges faster from teammate "Booyahs" and deals 33% more damage to Big Bubblers.

For the best experience, you should always update through the Official Nintendo Support methods: How to Update Splatoon 3 - Nintendo Support