Before we jump in to the process of how to factory reset your MacBook Pro, make sure that you have a (these steps will work for any Mac running OS X or macOS). You’ll also want to sign out of any connected accounts. To prevent headaches in the future, deauthorize your Mac in iTunes. Navigate to iTunes and in the menu bar click on Account → Authorizations → Deauthorize This Computer Also sign out of iCloud and iMessage. It doesn’t hurt to sign out of any other accounts under System Preferences → Internet Accounts as well.
Now you’re all set to move forward. How to erase your MacBook Pro and reinstall macOS Boot into macOS Recovery will install a different version of macOS depending on the key combination you use when starting up your Mac (no installation discs or macOS loaded onto an external drive is needed). Hold down one of following key combinations right after powering on your Mac, and let go when you see the globe or Apple logo. ⌘R (Command R) = Reinstall the latest macOS that was installed on your Mac, without upgrading to a later version. ⌥⌘R (Option Command R) = Upgrade to the latest macOS that is compatible with your Mac. Loading time for macOS Recovery will vary depending on your internet connection, when complete you’ll see the macOS Utilities window. Erase your startup disk (hard drive/solid state drive).
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Click Disk Utility in the utilities window, then click Continue. Reinstall macOS. Back on the main macOS Utilities window, click on Reinstall macOS. Follow the prompts and select which disk you’d like to install macOS (if you have multiple drives).
Plug in your power cable if you’re using a MacBook. Click Install. If you have an SSD you may see a 10-20 minute installation estimate, if you have a HDD likely much longer. When the installation is complete you’ll see the welcome screen with the region selector. If keeping your Mac continue on with the setup process. If selling or giving your Mac to someone else, use the keyboard shortcut ⌘Q to quit the setup assistant and power your Mac down.