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Mac Pro
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold ...
Command (⌘)-R
Installs the latest macOS that was installed on your Mac.
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
Thank you for trying to help but as the post states; l already tried that and several more similar options,:
Can't reinstall OS on MacBook Pro
