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Apple Computing Products:
macOS - Operating System
Installing original OS in Mid 2017 iMac
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<blockquote data-quote="Rod" data-source="post: 1897270" data-attributes="member: 204485"><p>For starters just try starting up holding <strong>shift - option - command - r</strong></p><p>I think that will be included it Jake's attached link above but if you are lucky it's all you'll have to do.</p><p></p><p>You say most of your software will not work with your current macOS so I assume you have 32bit apps that no longer work since the Catalina upgrade. That being the case you really only need to go back to Mojave. </p><p>The macOS that came with the 2014 Mac was Yosemite so you could then upgrade from there.</p><p></p><p>If you elect to go the way of the bootable USB installer on a thumb drive you will need to erase your present internal drive because Apple does not allow retrograde upgrades. That is, you can't update an existing OS to an older OS.</p><p></p><p>This entails making a clone or Time Machine backup first with which to restore your data after installing the old OS. All in all a much more complicated process with a greater risk of error. So do try the startup key command method first and if that doesn't work do get back to us on this thread.</p></blockquote><p></p>
[QUOTE="Rod, post: 1897270, member: 204485"] For starters just try starting up holding [B]shift - option - command - r[/B] I think that will be included it Jake's attached link above but if you are lucky it's all you'll have to do. You say most of your software will not work with your current macOS so I assume you have 32bit apps that no longer work since the Catalina upgrade. That being the case you really only need to go back to Mojave. The macOS that came with the 2014 Mac was Yosemite so you could then upgrade from there. If you elect to go the way of the bootable USB installer on a thumb drive you will need to erase your present internal drive because Apple does not allow retrograde upgrades. That is, you can't update an existing OS to an older OS. This entails making a clone or Time Machine backup first with which to restore your data after installing the old OS. All in all a much more complicated process with a greater risk of error. So do try the startup key command method first and if that doesn't work do get back to us on this thread. [/QUOTE]
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Apple Computing Products:
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Installing original OS in Mid 2017 iMac
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