If you're looking to update your FIFA 23 Legacy Edition on the Nintendo Switch, the best course of action is to check the Nintendo eShop directly for any available updates or DLCs. This ensures you're getting safe, legitimate content while supporting the game's developers.
: Features an updated visual identity and a refreshed broadcast overlay package. fifa 23 legacy edition switch nsp xci dlc upda link
If you have the NSP or XCI file of the base game, you must install the update to ensure your rosters are not outdated. Most users utilize homebrew managers like Tinfoil or DBI to sideload these files onto their SD cards. If you're looking to update your FIFA 23