Since Nintendo’s servers check for the latest software version, you cannot access "Network Play" in Mario Kart 7 without having this update installed.
If you are connected, the system will automatically prompt you that an update is available. MK7-EUR-3DS-(Update12)-CIA-Ziperto.rar
Earlier versions of the game were famous (or infamous) for shortcuts that allowed players to skip massive portions of tracks like Maka Wuhu by driving into the water at specific angles. This update ensures everyone plays on a level track. Decoding the File Name Since Nintendo’s servers check for the latest software
If you’ve been scouring the web for 3DS preservation files, you’ve likely run into long strings of text like MK7-EUR-3DS-(Update12) . To the uninitiated, it looks like gibberish; to a 3DS enthusiast, it’s a crucial piece of software. Specifically, this refers to the version of the Version 1.2 update for Mario Kart 7 . What is Update 1.2? This update ensures everyone plays on a level track
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.
The name of a well-known site in the ROM-sharing community. How to Install Updates Legally