"Please exclude according to the following ways:
1. Firmware upgrade may fail due to network instability. It is recommended that you change to a more stable network environment or try to upgrade again with mobile hotspot.
2. When the Bluetooth device upgrades the firmware, the app needs to be in the foreground running state all the time. If you exit the app, the firmware upgrade may fail.
3. If the problem still exists, please contact our customer service and provide your device ID information. "