If the system software disappears or is deleted, you can use the following methods to retrieve it:

Please check the mobile phone version first:

Funtouch OS 9.2/iQOO (Monster) UI and above versions: Go to phone settings--Applications and permissions--Application management--More--Built-in application management--find the corresponding system software and reinstall it;

Funtouch OS 4.5 to Funtouch OS version 9.1: Please go to Settings--More Settings--Application Management--Click "More" in the upper right corner--Built-in Application Management--Find the corresponding system software and reinstall it;

Funtouch OS 4.0 version: Please enter Settings--More Settings--Applications--Built-in Application Management--Find the corresponding system software and reinstall it;

Funtouch OS 3.2 version: Enter Settings--More settings--Restore factory settings--Clear data to restore.

Note: Clearing all data will clear all data on the phone (except SD card data), including installed applications, phone books, etc.

Please back up your phone before this operation important data in.