Why does the Redmi Watch 5 fail to connect on the Android phones?

If the background permission of the Mi Fitness APP are not enabled on the Android phones, the Mi Fitness APP will be removed from the background.
If the Redmi Watch 5 fails to connect on the Android phones, please refer to the following details:
1. In order to better use the watch and avoid one-tap memory cleaning in the Android system and some housekeeper software cleaning processes or interception;
2. It is recommended to keep the Mi Fitness APP running in the background. The opening path is as follows: After pairing, you can tap [Device] >> [Notifications and calls] >> [Background permissions] >> follow the instructions on the Mi Fitness APP.
Note:
If the watch cannot be searched after restoring to the factory settings, please refer to the following details:
1. After unbinding, if the device cannot be searched, turn off and on the Bluetooth of the mobile phone system again;
2. Check whether there is a pop-up window prompting the connection on the nearby mobile phone. If so, you need to reject it.