How to clean install macOS Catalina and older versions.

How to clean install macOS Catalina and older versions.


Speed up your Mac and rid it of problems by reformatting it before doing a clean install of macOS Catalina or another version

How to clean install macOS using a bootable USB

Before you begin you'll need the following:

  • A 15GB or larger removable USB flash drive to hold the installer file for our chosen version of macOS. (We're going to erase it, so make sure it doesn't contain any valuable data.)
  • Admin privileges for the Mac.
  • A back up, just in case something goes wrong.

Note that with regard to backups, you probably won't want to recover a Time Machine backup if you don't want to copy over all the setting and preferences associated with your old system. You could alternatively sync all your Documents and Desktop with iCloud rather than run a full backup, but make sure that everything you need is in the cloud and be aware that you may lose system setting and applications.

To get service for your iPhone, you can make a reservation at an Apple Store or an Apple Service Provider, if you have a repair iPhone, contact us an Apple Repair Center.

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