How To Update Garmin GPS Devices? This is one of the most common questions which is asked by thousands of Garmin device users over the web. For updating the same, the user must first download the Garmin Express software from the official Garmin website and then install the same. Connect the Garmin GPS Device with the system where the Garmin Express software is installed and over the application, search for the available updates and then download all of them one by one. Install them by giving the run command and then eject the Garmin device. Reboot it and then again start using it with the latest updates. It will work like wonders again.