If you are on an older version, the 3DS should prompt you to update upon launching. If not, you can open the Nintendo eShop and search for Animal Crossing: New Leaf to find the update patch, which is roughly 122 blocks / 15.25MB if you are coming from v1.4, or much larger if you missed the initial Welcome amiibo update.
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If you are still playing this classic, or returning to it, it is highly recommended to ensure you are on the latest patch to avoid error 004-6006. If you'd like, I can: for your town Explain the best ways to earn Bells in the game Give you a guide on how to get the Dream Suite Share public link If you are on an older version, the