If you cannot receive data from your Garmin 520 Plus device and cannot transfer data to Garmin Training Center, you can try the following steps:
1. Ensure that your Garmin device is properly connected to your computer via USB.
2. Verify that the device is turned on and not in sleep mode.
3. Make sure you have the latest version of Garmin Training Center installed on your computer.
4. Restart both your Garmin device and your computer.
5. If the issue persists, you may need to contact Garmin's customer support for further assistance.
