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How to downgrade Big Sur version OS to Catalina OS

How to downgrade Big Sur version OS to Catalina OS? if I restore it from time machine, is there a possibility that my data in my external hard disk gets erased?

MacBook Pro 13″, macOS 11.1

Posted on Apr 1, 2021 1:49 AM

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How to downgrade Big Sur version OS to Catalina OS

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