My phone interface can't be displayed, and contacts and phone books can't be opened. What should I do?

Third, clean up the data, and then go to the app store to download the software, which should solve it.

The method is to back up first (if you can't back up, you will ignore this step, but the data will definitely be lost) ~ Then turn off the computer ~ Press and hold the volume button and the power button at the same time ~ After entering, use the volume button to select, the power button to confirm, and select Clear Data and Clear Cache' to clear all data, which is Sanqing.

When restoring the backup, set the software in the mobile phone, and only restore personal data such as contacts, text messages and notes. Go to Xiaomi App Store to download the software. Try to see if it is normal!

PS: The way to resume is to turn off the power first, and then press and hold the volume button and the power button. Once inside, the touch screen is useless. You must use the volume button to select the power button to confirm, select Simplified Chinese ~ Clear Data ~ Select Clear Cache, Clear User Data and Clear All Data.

Then choose to turn off, and then press and hold the power button to turn on.