Issue with LYWSD03MMC Zigbee Firmware

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I’ve successfully flashed several Xiaomi LYWSD03MMC sensors with your Zigbee firmware, and most of them connected to my Zigbee2MQTT setup without issues. However, one sensor is not being detected by Zigbee2MQTT.

Here are the details:

  • The sensor displays data on its screen, and the Bluetooth icon is visible, indicating it’s not paired.
  • Despite being in pairing mode, Zigbee2MQTT does not detect it. There are no relevant entries in the logs (e.g., no “Device trying to join” messages).
  • I’ve tried replacing the battery (new CR2032, ~3000 mV), resetting the sensor, and placing it close to the coordinator.
  • The BLE flasher tool also does not detect this sensor.

Other LYWSD03MMC sensors with the same firmware connected fine.
Has anyone else reported a similar issue with an LYWSD03MMC sensor not being discovered after flashing? Could this be related to the firmware, a hardware defect, or something else? Any suggestions on how to troubleshoot or force the sensor to pair would be greatly appreciated.

Thank you for your time and support!

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