Alternatively, you can find the update manually by searching "Mario Kart 7 Update" in the 3DS eShop.
The primary reason for this update (and several others across the 3DS and Wii U era) was to patch a critical vulnerability known as "ENLButter." This flaw could theoretically allow a malicious user to take control of another person's console during online play. MK7-EUR-3DS-(Update12)-CIA-Ziperto.rar
By keeping your game updated, you ensure your console stays secure and your lap times stay legitimate! Alternatively, you can find the update manually by