Restoring factory settings does not change the system. It means deleting the phone book, SMS, and software installed by yourself, and restoring the phone to its original state. Brushing is equivalent to replacing or upgrading the system.
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Restoring factory settings is equivalent to deleting all settings, all user data, and all third-party software, leaving only the operating system of the bare mobile phone in the phone. When the phone encounters software compatibility problems that cannot be solved, you can first try to restore the phone to factory. Not only will all settings, all user data and all third-party software be deleted, but also the system itself will be deleted, and then a new mobile phone system will be installed, just like reinstalling the system for a computer. Restoring factory settings can solve some software problems, and you can avoid the need to clean the machine. However, when the system crashes and cannot be started normally, but there is a problem with the system itself, it can only be solved by cleaning the machine.