If the firmware upgrade fails of the Mijia Air Conditioner Pro Eco Inverter 1.5 HP, follow these steps:
1. Update the Xiaomi Home App to the latest version and retry;
2. Check if the Wi-Fi connection is stable;
3. Try switching to a different network and attempt the upgrade again;
4. Do not exit the upgrade interface or close the Xiaomi Home App during the update to ensure a complete installation.
If the issue persists, please contact the after-sales service for further inspection.