To check whether Mi Door and Window Sensor fail to update firmware, please refer to the following steps:
1. Ensure that your Mi Door and Window Sensor is securely linked to both your Mi Home app and the Mi Control Hub to ensure seamless communication between devices;
2. Check the stability and functionality of your internet connection to guarantee a smooth firmware update process;
3. Make sure that your Mi Home app is running on the most recent version by checking for updates in your device's app store. If an update is available, install it to access the latest features and enhancements;
4. Reboot both your Mi Door and Window Sensor and the Mi Control Hub to refresh their connections and settings, potentially resolving any underlying issues;
5. Try updating the firmware again after a few minutes;
6. If the issue persists, submit feedback through the Mi Home app and wait for the next update.