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I downloaded Catalina but it broke critical applications on my computer, I need to restore it to El Capitan as it was before, can I do it safely with a bootable USB?

Thank you

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  • Define "safely". Unless you have a backup of it from before the update, you can't go back 'downhill' without a complete wipe & start afresh. See apple.stackexchange.com/questions/309399/…
    – Tetsujin
    Commented May 27, 2020 at 7:49
  • Your disk is now APFS which El Capitan does not understand. I'm afraid you'll need to wipe the disk before installing El Capitan. Make a backup of your data first!
    – lhf
    Commented May 27, 2020 at 14:30

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