Download Garmin watchface app
*for mac user, use Android File Transfer to copy files to your Garmin watch.
- click download button.
- unzip the downloaded file.
- connect your watch to your computer with the device's USB cable.
- wait till the icon of your device shows up, double click to open it, and you should see the Garmin folder, open it, and double click to open the Apps folder in this Garmin folder.
- drag the 620cd5e6b9fb0.prg file into the "Garmin\Apps" folder.
- unhook your watch and your designed watchface should show up in a few seconds.