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:
- Ensure that your Garmin device is properly connected to your computer via USB.
- Verify that the device is turned on and not in sleep mode.
- Make sure you have the latest version of Garmin Training Center installed on your computer.
- Restart both your Garmin device and your computer.
- If the issue persists, you may need to contact Garmin's customer support for further assistance.