Mi Door and Window Sensor 2 cannot connect to Bluetooth gateway.

If the Mi Door and Window Sensor 2 cannot connect to Bluetooth gateway, please refer to the following steps:
1. Confirm whether there is a Bluetooth gateway or Bluetooth Mesh gateway near the device and place it as close to the gateway as possible;
2. Check that the Bluetooth gateway is compatible with the Mi Door and Window Sensor 2. Check the specifications and compatibility list provided by the manufacturer;
3. Try resetting the Bluetooth gateway by powering it off and then back on again. This can sometimes resolve connectivity issues;
4. Similarly, restart the Mi Door and Window Sensor 2 by removing and reinserting its battery or power source;
5. Double-check the settings in the Mi Home app to ensure that the sensor is properly configured and paired with the Bluetooth gateway;
6. Check for any firmware updates for both the sensor and the gateway in the Mi Home app. Install any available updates to ensure compatibility and improved performance;
7. Attempt to reconnect the sensor to the Bluetooth gateway within the Mi Home app. Follow the app's instructions for adding a new device or re-pairing an existing one;
8. If the issue persists, contact your local after-sales for further assistance regarding this issue.