If your computer has not been updated to Catalina, you will need to deauthorize your computer from the iTunes app. Resetting a Mac to factory settings deletes all the data stored on that device, you can make a backup of the data using Time Machine software Apple provides - Here's how to back up using Time Machine. You should back up your computer, disable some features and services, and then go on booting to Recovery Mode and using Disk Utility to erase (format) a hard disk and reinstalling macOS.
Things you can do before you erase a Macbookīefore you erase your Mac, make sure your Mac is currently connected to the internet and plug in the power adapter, so there's no danger of running out of battery power.
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