Updating the Software Using Garmin Connect
Before you can update your device software using the Garmin Connect app, you must have a Garmin Connect account, and you must pair the device with a compatible smartphone (Pairing Your Smartphone with Your Device).
Sync your device with the Garmin Connect app (Manually Syncing Data with Garmin Connect).
When new software is available, the Garmin Connect app automatically sends the update to your device. The update is applied when you are not actively using the device. When the update is complete, your device restarts.