The following situations can cause the upgrade to fail:
1. The network is disconnected during the download of the upgrade package by the Mi Fitness APP, which causes the download of the upgrade package to fail;
2. When the App pushes the upgrade package to the watch, the distance between the watch and the mobile phone is too far, which causes the transmission to be interrupted;
3. The watch is too low in power and automatically shuts down during the upgrade process. After the watch fails to upgrade, it will automatically restart. After it is turned on, the watch can still be used, but the version before the upgrade is maintained. You can upgrade again after ensuring that the watch has sufficient power and that the download of the installation package is completed.