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Big Sur for iMac 27" 2020

I have more problems to install the last macOS Big Sur for my Mac 27" 2020. Who has the same problems ? Have you solved it ?


iMac 27″, macOS 10.15

Posted on Nov 15, 2020 10:26 AM

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Posted on Nov 15, 2020 12:10 PM

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How to upgrade to macOS Big Sur - Apple Support

4 replies

Nov 17, 2020 9:30 AM in response to Gabry_19

I am having issues with two iMacs. One is a 27″ 2019, the other is a 27″ 2020 iMac. Both seem to install OK, but will not reboot. If I reboot from originally installed Catalina, I see a partial unbundling of the Big Sur installer in the System…/volumes folder.


I created an external Big Sur boot HD using a 2013 MacBook. I have not converted the internal MacBook from Catalina to Big Sur yet, too many potential pitfalls. Macbook Pro boots just fine from external disk, but will not boot either iMacs.


Big Sur for iMac 27" 2020

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