The official Nintendo support page lists the changes concisely:
If you are manually sourcing this update (via homebrew or eShop history), here are the exact technical details:
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The sun rises over Astoria, a town that has recently undergone a renaissance. Ever since the Welcome amiibo update, the air feels different. The Mayor steps out of their house and is immediately greeted by the sight of a notification on their TPC (Town Pass Card).
On the main menu screen, look at the top-right corner. It should indicate the version number. If it says 1.5, you are fully updated. The official Nintendo support page lists the changes
The update specifically aimed to fix a frustrating error code () that occurred when players tried to receive DLC items, campers, or presents from the Internet. For European players, this patch meant seamless interaction with the newly introduced Campground and amiibo functionality. Key Features Enabled by the Welcome amiibo Era (Patch v1.5)
The purpose of the Welcome amiibo update was twofold: Can’t copy the link right now
This is the easiest and most reliable method:
Sometimes, the 3DS system will automatically detect that an update is available for a game as soon as you hover over its icon on the HOME Menu. If that happens, simply follow the on‑screen instructions.
Unlike the North American (USA) version, the European (EUR) release accommodated a vast array of languages, including English, French, German, Spanish, and Italian. It also featured exclusive regional holidays and items, such as the during the Autumn Moon or the Beret distributed during specific European region events.
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