It's been the case for a while that firmware updates are automatically installed by the macOS installer at the beginning of the install process (I believe right after the first reboot), so if your machine needs one to run High Sierra, it should have been taken care of automatically. Anything older than a High Sierra firmware update would have been distributed and installed transparently along with security updates and macOS point releases.
You said the installer runs for some time and then displays the error. Is it possible you have a failing hard disk or a filesystem problem? It may explain why the installer starts, runs for a while, and then fails, as it's not encountering a problem until later in the process. I'm a fan of Diskwarrior, so if you have that, run it. If not, try repairing the disk from within Disk Utility and see if it offers any clues. I don't have access to this entire thread from the machine I'm on right now, so I don't know if you wiped the drive to install Sierra or upgraded; if you wiped the drive, that would eliminate the file system as a possible cause, though not the hard disk itself. Can you describe exactly when the error is shown? Is the installer copying files when the error occurs, or does it happen at some other time? - Matt On Tue, Nov 14, 2017 at 1:12 PM, Carl Hoefs <[email protected]> wrote: > I did try the “Upgrade to High Sierra” route via the App Store, but got > the same results after an hour of installing: "macOS can't be installed on > this machine”. What a hassle. It’s a core i5 2.7GHz 27” mid-2011 iMac, so > it’s not like it’s an ancient machine or anything. Should be upgradeable, > right? > > Given that Sierra installs on it fine, but not HS, it could be the > firmware issue. Is there a firmware upgrade available separately? I don’t > see one on Apple’s downloads web page. > > -Carl > > > > On Nov 14, 2017, at 10:45 AM, @lbutlr <[email protected]> wrote: > > > > On 13 Nov 2017, at 13:15, Carl Hoefs <[email protected]> > wrote: > >> But... I couldn't get the High Sierra installer to work, regardless. I > had to install Sierra instead. This is on an iMac12,2. > > > > It seems that a new install of High Sierra needs to be done by running > the installer application in macOS. The firmware update that needs to be > applied to allow APFS booting seems to require this, and it's integrated > into the application, not the boot image. > > > > Not 100% sure on this, but machines that simply boot from a HS 10.13 > installer and have never had 10.13 on them don't seem to be able to install > properly. > > > > -- > > Apple broke AppleScripting signatures in Mail.app, so no random > signatures. > > > > _______________________________________________ > > MacOSX-talk mailing list > > [email protected] > > http://www.omnigroup.com/mailman/listinfo/macosx-talk > > _______________________________________________ > MacOSX-talk mailing list > [email protected] > http://www.omnigroup.com/mailman/listinfo/macosx-talk >
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