If your ZeWatch4/4HR can not synchronize your data or if you receive a failed message, please close the application and then log on. Perform a new syncing process.
For this, your ZeWatch4/4HR must be paired and your mobile device must be nearby.
Feel free to turn off/on internet connection (3G / 4G or WiFi) if necessary.
If the problem persists, restart your smartphone then perform a manual reset of your device.
To synchronize your data, go in the activity homepage of the mobile application and scroll down with your finger.