You will need the specific update file that matches your game's Region ID (USA, EUR, or JPN).
This is the format used for digital eShop games, DLC, and Updates . Fire Emblem Engage Switch XCI NSP Update 1.3....
Remember that to use the 1.3.0 content (Chrom/Veronica), you must also have the DLC/Expansion Pass NSP installed. Why You Shouldn't Skip Version 1.3.0 You will need the specific update file that