2.iOS user data can't be synchronized: ensure that the sports health App version is the latest version, and the Bluetooth connection between the sports health App and Huawei WATCH FIT is normal. Pull down the home page of sports health App and try to synchronize manually. If you still can't synchronize, please restart Huawei WATCH FIT and try again. If you still can't synchronize, try to disconnect Bluetooth and try to synchronize. If you still can't synchronize the data through the above methods, please close and clear the sports health App from the background of the mobile phone, then reopen it and try to synchronize again.