As of mid-2025, for Mario Kart 8 Deluxe . Nintendo has officially moved on to the next Mario Kart title (rumored for the “Switch 2” backward compatibility). However, “Update 30” may refer to a hypothetical stability patch (3.0.1 or 3.0.2) that fixes minor bugs in the Booster Course Pass.
Always ensure your prod.keys and title.keys are updated to the latest version to avoid "Could not open software" errors on your custom firmware.
The 3.0.3 update serves as a maintenance patch to refine the experience following the massive 3.0.0 "Wave 6" expansion.
If the file size isn’t exactly 4,024,307,712 bytes for the update NSP, or if the base XCI isn’t exactly 13,372,942,336 bytes (for original US version), delete it. Verified releases have precise sizes.
How to Update Mario Kart 8 Deluxe | Nintendo Switch | Support