If you are using an (the standard format for eShop game dumps) rather than an XCI (cartridge dump), this update is highly recommended for two technical reasons:
If you enjoy a game, consider buying it. Supporting developers ensures they can continue to create more games. miitopia switch nsp update 103
No. Updates are designed to sit alongside your save data. Your Miis, levels, and relationships will remain intact. If you are using an (the standard format