Why does the Mijia Air Conditioner Pro Eco 5-Star 1.5 HP Inverter fail to upgrade the firmware?

Several factors will make the firmware upgrade fail, such as Wi-Fi network environment, APP version, signal disturbance of other devices and wrong operation in the process of firmware upgrade.
If the firmware upgrade of the Mijia Air Conditioner Pro Eco 5-Star 1.5 HP Inverter fails, please refer to the following details:
1. Please upgrade the Mi Home/Xiaomi Home APP to the latest version;
2. Please check whether the Wi-Fi network is normal;
3. Please change the network environment and check whether the upgrade can be carried out normally;
4. During the firmware upgrade process, please do not exit the upgrade interface or the Mi Home/Xiaomi Home APP to ensure that the upgrade is accomplished completely.
If the above steps still cannot solve the problem, it is recommended that you apply for an after-sales inspection.