Mario Kart — 8 Deluxe Nspchupdate 303rar

According to Nintendo's official patch notes, "several issues have been addressed to improve the gameplay experience".

If you're looking for update 3.0.3 (implied by "303") for Mario Kart 8 Deluxe in NSP format within a RAR archive: mario kart 8 deluxe nspchupdate 303rar