Make sure you're using the latest Geonaute Software. 2. Check the metal contacts at the back of your watch for signs of corrosion. If they are corroded, clean them with alcohol or vinegar and a cotton swab. Also check that the clip is correctly positioned on your watch. 3. Reinstall product drivers: 3.1 On your computer, go to the Control Panel, System tab, then open the Device Manager. 3.2 Open the Ports tab (COM & LPT) and right click on "STMicroelectronics Virtual COM Port," corresponding to your device and select Uninstall. Your device will no longer be recognised. 3.3 Unplug and then plug in your device; the drivers will automatically reinstall and the following pop-up window will be displayed: 3.4 Check that the product has been properly recognized by the Device Manager. 4 - If you're still experiencing difficulty, please contact one of our support technicians via the "Contact" page at the bottom of this website.