If the console fails to launch Mario Kart 8 Deluxe even with updated firmware, a partial or bad .nsp installation block may be trapped in your system cache. Boot the Switch into first.
: For general instability or random crashes after the update, users often perform a fresh install of the mariokart8deluxeupdate303nsprar fixed
Alternatively, the update will download if you have automatic software updates enabled in your Switch system settings. If the console fails to launch Mario Kart