Take MX3 as an example, data must be cleared in the following situations: (1) Turn on the ROOT option.
(2) Users who have installed LBE security master and fixed the vulnerability of Android signature.
(3) Brush back the firmware whose version number is lower than the current version of the mobile phone. (Same as current version, no need to clear data)
In the above situation, you must clear the data, otherwise you may not be able to boot normally. Clearing the data will cause the loss of personal data such as contacts, so please pay attention to synchronous backup.
After clearing the data, system files such as contacts, SMS, emails and third-party programs will be deleted. User files such as music, photos and videos on the storage disk will not be deleted.
To put it simply: except for the data stored in the storage disk, all other mobile phones will be restored to the original state of the factory.
The Flyme backup function of the mobile phone can backup the items displayed in data synchronization. Others are not backed up.
Game progress, chat history, these applications are not backed up by themselves, and they are not kept after the mobile phone clears the data.
The "Application Center" of desktop applications on mobile phones has the setting of "Backup Desktop under WLAN", which only backs up the application icons on the desktop, that is, downloads the application again when data synchronization is cleared, but uses data (game progress, login information, etc. ) is not preserved in the application.