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Old 13th January 2021 | 07:36
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crewmeal
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From: BHX LXR ASW
Once you erase everything using disk utility you will need a rebootable USB with the latest operating system on it which is Big Sur. Once you've done that you'll have a clean Macbook

https://www.imore.com/how-do-clean-install-macos

If it doesn't give you the help you need there is plenty of info via Google.

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