Need to run Catalina, Mojave or an older version of macOS on an M1 Mac? Here's why you can't - and what your best option is
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How to boot an M1 Mac into an older version of Big Sur – The Eclectic Light Company
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How to install a Windows 10 Virtual Machine on an M1 Mac for free, by Keith Myers, Mac O'Clock
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How to Run Windows 11 for Free on an M1 or M2 Mac - The Mac Security Blog
How to Factory Reset M1 Mac (MacBook Pro, Air, iMac, Mac mini)
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How to boot an M1 Mac into an older version of Big Sur – The Eclectic Light Company
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macOS compatibility: What macOS versions can my Mac run?