The unread information of Lenovo s850 back cover indicator light does not explain what the problem is.

According to the description, you can refer to the following suggestions:

1. It is recommended to enter the system settings-display-light effect-unread SMS of the mobile phone to see if the function of reminding light effect is checked and turned on. If it is not recommended, check and open it before use and observation;

2. If the light effect switch has been turned on, but there are unread messages, the indicator light does not indicate the light effect. It is suggested to back up the important data on the mobile phone (to avoid the risk of data loss), then restore the mobile phone to the factory settings, and then observe the use to see if it is caused by system abnormality;

3. If the problem still exists after the above operation, it is suggested to take time to Lenovo authorized maintenance point for specific detection and treatment.