Use Erase All Content and Settings to quickly and securely erase all of your settings, data, and apps, while maintaining the operating system currently installed.
Source: Erase your Mac and reset it to factory settings – Apple Support
Helpful Mac Os Repair information starts here
Use Erase All Content and Settings to quickly and securely erase all of your settings, data, and apps, while maintaining the operating system currently installed.
Source: Erase your Mac and reset it to factory settings – Apple Support
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