It is not complicate to reinstall macOS Big Sur or Catalina, but if you want to reinstall macOS without losing data, there are 3 steps you must follow. In the case that you want to sell your mac, besides erasing all your personal data and traces on the mac, you will need to reinstall macOS as well. When you continuously see error messages appear on your mac, or your programs randomly crash/freeze for no reason, like FaceTime won't work, Contacts or Calendar shows a delay or mess, blue teeth or WiFi won't connect…Then, you have a good reason to reinstall macOS. Your System Keeps Crashing or Works Improperly.Therefore, doubtless, there will be new versions of macOS available to upgrade and reinstall.Īs we all know, for no specific reason, system reinstallation can magically solve a slow Mac in most cases. Reinstall When There is New macOS Version AvailableĪpple keeps working constantly to fix bugs, make performance tweaks, add new features or enhance coding.If you have installed Big Sur, Catalina, Mojave or earlier versions, you may have to reinstall macOS for following reasons:

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