Upgrading from High Sierra IOS to Big Sur IOS on a 2011 Imac 27"

You cannot upgrade to macOS Catalina no matter what you do. You need to stay on macOS High Sierra.

Also, you cannot upgrade any component other than the RAM. Upgrading anything else is considered non user-upgradeable and either can't be done or shouldn't be done.

Cheers,

Jack

Hi there,

First, Macs run macOS, not iOS.

Secondly, no, you cannot upgrade higher than High Sierra. Your Mac is no longer supported.

Cheers,

Jack

How can I update my Mid-2011 27" iMac with a new SSD from High Sierra to Catalina? Do I need to upgrade my videos card?