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Apple Computing Products:
macOS - Operating System
Creating a Bootable Installer for MacOS
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<blockquote data-quote="MacInWin" data-source="post: 1813319" data-attributes="member: 396914"><p>Patrick, sorry to be so long in getting back, but I wanted to test myself before I responded.</p><p></p><p>First, for iOS as Apple does that system differently than for macOS. iOS is always going to be updated to the latest release, so you experience is exactly what I would have expected. And I would also expect that along the way between purchase and restore there were opportunities to update to the versions along the way, but Apple ceases to sign previous releases of iOS when a new release is made. So even if you wanted to get something between original and current, and even if you still had the install files, they would not install because Apple would not verify them for the phone. It's been that way from the first iPhone to now. The previous version is only there for a day or so after a new release, just in case someone upgrades and for any reason wants to go back. That decision to go back has to be made very quickly as the signing is rescinded within days.</p><p></p><p>OK, but that's not how it works for macOS. Apple makes it possible to go all the way back to what the system originally had, at least as far as the downloaded versions. And to test that for you, I took my backup MBP that had High Sierra installed and booted with Opt-CMD-R and did an internet install. It installed, as I expected, the original version, Lion. And from there I upgraded to El Capitan by looking into the Mac App Store and finding there my previously "purchased" installer for El Cap. Then I did an update to the last version of El Cap. And from there I upgraded to High Sierra, which put (or will put, it's still in process) the system back to what it was a few hours ago. </p><p></p><p>I know you are often a sceptic when it comes to Apple, but in this case, if done properly, you can get back to what was originally on the system and then move along any previously installed versions to the highest the system will support. Just as Apple says you can.</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1813319, member: 396914"] Patrick, sorry to be so long in getting back, but I wanted to test myself before I responded. First, for iOS as Apple does that system differently than for macOS. iOS is always going to be updated to the latest release, so you experience is exactly what I would have expected. And I would also expect that along the way between purchase and restore there were opportunities to update to the versions along the way, but Apple ceases to sign previous releases of iOS when a new release is made. So even if you wanted to get something between original and current, and even if you still had the install files, they would not install because Apple would not verify them for the phone. It's been that way from the first iPhone to now. The previous version is only there for a day or so after a new release, just in case someone upgrades and for any reason wants to go back. That decision to go back has to be made very quickly as the signing is rescinded within days. OK, but that's not how it works for macOS. Apple makes it possible to go all the way back to what the system originally had, at least as far as the downloaded versions. And to test that for you, I took my backup MBP that had High Sierra installed and booted with Opt-CMD-R and did an internet install. It installed, as I expected, the original version, Lion. And from there I upgraded to El Capitan by looking into the Mac App Store and finding there my previously "purchased" installer for El Cap. Then I did an update to the last version of El Cap. And from there I upgraded to High Sierra, which put (or will put, it's still in process) the system back to what it was a few hours ago. I know you are often a sceptic when it comes to Apple, but in this case, if done properly, you can get back to what was originally on the system and then move along any previously installed versions to the highest the system will support. Just as Apple says you can. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Creating a Bootable Installer for MacOS
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