For those who downloaded NSP/XCI files and use custom firmware, the update process typically involves:
If you want version-specific patch notes, the latest build number, or a changelog, tell me which region/version you need (or I can search for the latest update notes).
The Ultimate Guide to Pikmin 4 on Nintendo Switch: Updates, Features, and Formats
, released on December 16, 2025, focused on refining the experience: Pikmin 4 – Update Overview – Nintendo Switch
Download the Pikmin 4 NSP base + separate Update NSP. Avoid "XCI + Update" merged packs unless you trust the repacker, as they frequently cause signature errors on Firmware 16.1.0+.