What are you using? (DBI, Tinfoil, Goldleaf, etc.) What firmware version is your Switch currently running? Are you encountering any specific error codes ?
Newer eShop updates often require higher Nintendo Switch system firmware. If your console is running an outdated system version, the updated game may refuse to boot, prompting a system update error. Moto Racer 4 Switch NSP -UPDATE- -eShop-
If you see "Moto Racer 4 Switch NSP -UPDATE-", this most commonly refers to the series of official patches released for the game. The Switch version of Moto Racer 4 launched in a state that was greatly improved by significant updates that refined its core gameplay and addressed many early criticisms. These are the most notable patches: What are you using