Why did Xiaomi's mobile phone call and see that the SMS display was not installed?

Install Xiaomi mobile assistant on the computer, and then connect the mobile phone to the computer with a data cable, and the mobile phone will be automatically connected to Xiaomi mobile assistant.

First, click Backup in the mobile assistant interface to prevent data loss after the phone is swiped.

After the backup is completed, click Refresh on the mobile assistant interface and follow the prompts. After refreshing, click the backup package on the mobile assistant to restore the backup.