What to do if the Mi Fitness APP cannot connect or the Bluetooth cannot connect when the Xiaomi Smart Band 9 is connected to the phone?

For your reference, there are two scenarios and corresponding solutions:
1. If you encounter this situation: the Bluetooth is still not connected under the connection between the Xiaomi Smart Band 9 and the phone, the band disconnected from the phone when it is out of range. Please reopening the Mi Fitness APP automatically leads to successful reconnection. This process ensures that the Xiaomi Smart Band 9 can reconnect to the phone's Bluetooth and resume synchronization with the Mi Fitness APP, resolving any connectivity issues caused by range or device restarts;
2. If you encounter this situation: The APP cannot be connected but the Bluetooth can be connected After rebooting the phone under the connection between the Xiaomi Smart Band 9 and the phone.  Please reopening the Mi Fitness APP automatically leads to successful reconnection. This step is crucial to establishing a stable connection between the Xiaomi Smart Band 9 and the phone, allowing seamless data synchronization and functionality between the band and the APP.