If you want to reset your Mac to its original state to start from scratch, you can use the macOS Erase Assistant to do it. Apple also created this app to make it easy for anyone who wants to sell, give away, or trade in their Mac to erase it using minimal steps.

As a standalone app, it lives hidden away on your Startup Disk at /System/Library/Core Services. However, it also gets run by the system via the System Settings app, via instructions at the end of this article.


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