Nintendo has finally released the highly anticipated patch for Mario Kart 7. You’ll be happy to know that the Wuhu Mountain Loop shortcut that plagued online multiplayer is now a thing of the past. The update also fixes similar issues found in GBA Bowser Castle 1 and Wuhu Island Loop.
The Mario Kart 7 update data can be found in the 3DS eShop. As long as you have the latest firmware you shouldn’t have any issues. If you don’t download the patch you won’t be able to play online. If you need full instructions, you can head over to the official Nintendo website for more details.
Source: Press Release