How to clean the firmware of miui system? The firmware of miui system contains the contents of normal operation of the mobile phone system and other files, and cannot be deleted. If the memory of the mobile phone is not enough, you can enter the security center to clean up other unnecessary file data.
1. On the desktop of MIUI system, click the "Security Center" application icon.
2. Click the "garbage cleaning" menu option, and the application will automatically scan the junk files in the system.
3. After scanning, click the "Clean up the selected garbage" button.