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It's a previously owned 2012 27-inch iMac. Any time I try to bring the machine forward to Catalina, it balks in High Sierra with a dialog that claims the machine is not configured correctly for the update and is incompatible.
Any notion what was done to the machine and how to fix it?
Thank you in advance for any reply.
iMac 27″, macOS 10.13
Frank Pryor wrote:
Thank you, den.thed,
Indeed, I cannot eliminate that possibility, but I reviewed the System Report on this machine repeatedly as I've tried to figure out this issue.
I'm sorry I can't share a verbatim report of the dialog box rejecting the upgrade from High Sierra to Mojave, but the machine is currently engaged in critical service and I can't take it offline for a few days.
No problem.
Please check the internal drives format.
While it is possible to install and run High Sierra on a Mac OS Extended (Journaled) formatted internal drive.
It is not possible to Upgrade or Install a later macOS until the drive is formatted APFS.
Frank Pryor wrote:
Thank you, den.thed,
Indeed, I cannot eliminate that possibility, but I reviewed the System Report on this machine repeatedly as I've tried to figure out this issue.
I'm sorry I can't share a verbatim report of the dialog box rejecting the upgrade from High Sierra to Mojave, but the machine is currently engaged in critical service and I can't take it offline for a few days.
No problem.
Please check the internal drives format.
While it is possible to install and run High Sierra on a Mac OS Extended (Journaled) formatted internal drive.
It is not possible to Upgrade or Install a later macOS until the drive is formatted APFS.
That is correct, please follow the instructions for the version of Mac OS (it seems Mojave or Catalina) and please follow them. After reading the instructions on how to upgrade the version of Mac OS you want on your system and you still have a problem then let us know.
Note: If you happen to be running any third party antivirus, cleaning or ANY other third party maintenance apps that could be one source of your problem.
If you continue to have a problem, the next step would be to do a Safe Mode Restart and then re-attempt to download and install Mac OS.
If you still have a problem after doing a Safe Mode Restart then my suggestion would be for you to post an EtreCheck report of your system see we can look it over to see if there are issues that may be causing your problem. If we get to that point we will be happy to provide you instructions on getting EtreCheck and how to post the report.
"I believe I followed the instructions as I was able to upgrade the machine to High Sierra with no problems. Also, the upgrade proceeded without a problem until at the end of the multiple attempts to upgrade from High Sierra to the next OS a dialog popped up stating specifically that it was not possible to complete because the machine was not configured in a way compatible with the upgrade. "
Based on the highlighted comment I'd recommend calling AppleCare ( AppleCare contact Information ) and tell them about the popup and ask for their advice.
Thank you, den.thed,
Indeed, I cannot eliminate that possibility, but I reviewed the System Report on this machine repeatedly as I've tried to figure out this issue.
I'm sorry I can't share a verbatim report of the dialog box rejecting the upgrade from High Sierra to Mojave, but the machine is currently engaged in critical service and I can't take it offline for a few days.
[Edited by Moderator]
Thank you,
I believe I followed the instructions as I was able to upgrade the machine to High Sierra with no problems. Also, the upgrade proceeded without a problem until at the end of the multiple attempts to upgrade from High Sierra to the next OS a dialog popped up stating specifically that it was not possible to complete because the machine was not configured in a way compatible with the upgrade.
I will try it again when I'm able to take the machine out of service, sometime after next week, which is contingent upon the machine I'm replacing it with being able to run all of my production software.
Please do not close this thread until I've been able to try it again. In the meantime if anyone knows of any configuration conditions that would prevent Mojave from loading on this machine please let me know.
Double check the year model.
Please CAREFULLY read and use How to get old versions of macOS
Thank you rkaufmann,
There is nothing in that literature I can see which prevents me from upgrading a late 2012 iMac from High Sierra to Mojave, or indeed to Catalina.
Thank you.
The drive is formatted as HFS+. I assume the solution is to do a factory reset and then format the drive as APFS?
You're welcome.
Yes and then restore your user data from backup.
2012 iMac stuck on High Sierra, not accepting OS updates
