Go to File > Install File to NAND and select the Update NSP.
The Ultimate Guide to Splatoon 3 on Nintendo Switch: Managing NSPs, Updates, and DLC splatoon 3 switch nsp update dlc
When Splatoon 3 launched, it was incredibly polished, but it was missing a few beloved features from Splatoon 2 (most notably, the ability to queue with friends in standard Turf War). Nintendo fixed this and vastly expanded the game through its periodic updates. Go to File > Install File to NAND and select the Update NSP
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CFW users frequently encounter strict verification checks when modifying massive online shooters. Below is a breakdown of common errors and how to fix them: Expansion Pass DLC: Worth Buying? - Splatoon 3