Updating the Software Using the Garmin Express Application
Before you can update your device software, you must download the Garmin Express application.
- Connect the device to your computer using the USB cable.
Garmin Express looks for software updates automatically and sends them to your device.
- Follow the on-screen instructions.
- Disconnect the device, and turn it on.
The device LED flashes 
to indicate the device is updating. When the update is complete, the LED flashes green 20 times.