Solutions:
In order to ensure the stability of MIUI function, the system will limit the uninstallation and deactivation of some software.
1. Open the "Settings" -- "Apps" -- "Manage apps" on the phone, and all the software installed in the system can be viewed.
Since this directory will contain system integration functional software and basic service components, if the software need to be uninstalled, it is recommended to do so in the "downloaded" list.
-- after clicking the APP name, if the "uninstall" option can be seen, it means can be uninstalled; If it is another option, it cannot be uninstalled.
-- system functional software is not allowed to be uninstalled. If in the strong demand, it is suggested to turn on the ROOT permission to operate through the third-party software. Xiaomi do not provide guidance, because it may cause system abnormalities.
2. In the "downloaded" directory, click the APP name to see various options, such as: uninstall, uninstall update, deactivate (optional), deactivate (grey and not optional).
①Uninstall -- on behalf of the current APP can be deleted, and will not affect the system stability.
②Uninstall update -- represents that the current APP belongs to the system's own application, and there is an update record. Selecting "uninstall update" will prompt "do you want to uninstall update?" Or " the application will be replaced with the factory version ", meaning that all relevant updates will be uninstalled.(the prompt message may vary depending on the MIUI version)
-- after uninstalling the update section, the APP name will disappear from the "downloaded" list, remain visible in the "all" list, and the "deactivate" option can be seen, such as the built-in "browser."
After uninstalling the update, a search in the app store will reveal the option to "upgrade" rather than install it, such as "Google pinyin input method".
③Deactivate (optional) -- it means that the current APP can be stopped, and the relevant APP may not work normally. After "deactivate", it can be "enabled" again, such as "radium".
④Deactivate (grey and not optional) -- represents that the current APP belongs to the key functions of MIUI system, such as "phone", "find mobile phone", "email".