Since Legacy Edition does get live squad updates via EA servers without connecting to Nintendo (bannable on hacked Switch), you have two options:

Searching for " FIFA 22 Legacy Edition Switch NSP ATUALIZACAO" often leads to guides for updating the game via unofficial or "NSP" file methods. If you are using a standard Nintendo Switch, the official and safest way to update your game to the latest version is through the console's built-in system. How to Update Nintendo Switch

The "Legacy Edition" label indicates that the game is a roster and kit update of the prior year's title. In the case of FIFA 22 on Switch, it utilizes the same gameplay innovations and modes found in FIFA 21 Legacy Edition FIFA 20 Legacy Edition

For CFW users, finding the means locating both the base game and the separate patch file (usually named 0100b9600b9a8000 for the update).

Diferente das versões para PlayStation 5, Xbox Series X ou PC, a versão para Nintendo Switch do FIFA 22 não é construída no motor gráfico atual (Hypermotion/Next-Gen). A Electronic Arts (EA) rotulou-a como "Legacy Edition".