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Apple Computing Products:
macOS - Operating System
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<blockquote data-quote="MacInWin" data-source="post: 1816923" data-attributes="member: 396914"><p>Dennis, that is correct, but I've taken an older Mac all the way back to Snow Leopard, then brought it back up to High Sierra, so you definitely CAN downgrade if you are willing to pay the price in labor and time (and lost data). The Internet Recovery process can install the version that came from the factory (or the oldest compatible version if that version is not available over the internet). For a Mojave formatted drive that's about the only way to get back to older versions because of the way Apple re-engineered the Mac App Store and how they put that Software Update Pane in System Preferences that intercepts all attempts to get back to the old store. The old store is there, available for those who have not or cannot upgrade to Mojave, so if you have an older Mac it's actually easier to revert from Mojave because you can build a bootable thumb drive on the older machine and then boot the Mojave hardware from that thumb drive and wipe out the internal drive and get back to HFS+ and an older version of the OS. </p><p></p><p>But if you have only ONE system, about the only way to get back is to do the Internet Recovery back to the original system and then work forward from there.</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1816923, member: 396914"] Dennis, that is correct, but I've taken an older Mac all the way back to Snow Leopard, then brought it back up to High Sierra, so you definitely CAN downgrade if you are willing to pay the price in labor and time (and lost data). The Internet Recovery process can install the version that came from the factory (or the oldest compatible version if that version is not available over the internet). For a Mojave formatted drive that's about the only way to get back to older versions because of the way Apple re-engineered the Mac App Store and how they put that Software Update Pane in System Preferences that intercepts all attempts to get back to the old store. The old store is there, available for those who have not or cannot upgrade to Mojave, so if you have an older Mac it's actually easier to revert from Mojave because you can build a bootable thumb drive on the older machine and then boot the Mojave hardware from that thumb drive and wipe out the internal drive and get back to HFS+ and an older version of the OS. But if you have only ONE system, about the only way to get back is to do the Internet Recovery back to the original system and then work forward from there. [/QUOTE]
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Apple Computing Products:
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