Follow the points below if you want to know how to update Garmin Nuvi. You can do it the official way by downloading Garmin Express.
Tap on the ‘Download for Windows’ button.
Double-click on the file of setup and adhere to prompts.
Agree to the terms and conditions, tap ‘Install’ and hit ‘Yes.’
Connect the Garmin Nuvi to your device.
Launch Garmin Express.
Tap on the ‘Get Started’ button. Then, tap on ‘Add a Device.’
Hit ‘Add Device’ when prompted.
Finish the setup process.
Tap on ‘Install All’ and wait for Garmin Nuvi to complete installing updates.