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Level 1

26 points

Mid 2011 iMac won't upgrade to high sierra

The hard drive on this iMAC died and I replaced it. I was able to load OSX 10.8 on it since I already had it loaded on a USB and thought I could just hit the update button and get it up to high sierra. I keep getting an unknown error when trying to do the updates so I tried doing the updates one by one. I was able to do a lot of them except itunes.

I made a bootable high sierra USB but it won't show up when i hit option O. It also doesn't show up as an option for a start up disk.

what gives?

iMac 27″, macOS 10.15

Posted on Feb 10, 2021 8:56 AM

Best reply

BDAqua

Level 10

239,213 points

Posted on Feb 10, 2021 10:44 AM

And it won't upgrade using the standalone installer?

Try reinstalling this in Safe Mode, but not using Firefox...

https://itunes.apple.com/app/macos-high-sierra/id1246284741?mt=12

Safe Boot, (holding Shift key down at startup).

Seems to fix about 90% of the problems.

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Mid 2011 iMac won't upgrade to high sierra

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