How to install any Mac OS - El Capitain or whatever - on a "bare metal" Mac Pro 4,1?

July 20, 2022

Ok, I am able to install High Sierra using the dosdude1 patcher.

But reading on the forum I know I need to update the firmware in this Mac Pro 4,1 and try to get it to 5,1 level.

According to what I've read, I need to boot into a "clean" Mac OS install not one that's been patched, to be successful in updating the firmware.

I've tried to make bootable USB installs using the Apple Support instructions that are linked in several threads.

You can use an external drive or secondary volume as a startup disk from which to install the Mac operating system.

support.apple.com

But...

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