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houstonalle Author

Level 1

33 points

Making a bootable HD

How do I make a bootable disk which I can load OS Big Sur to to update my firmware?

Posted on Oct 11, 2022 11:16 AM

Top-ranking reply

John Galt

Level 10

146,510 points

Posted on Oct 11, 2022 11:43 AM

Follow How to reinstall macOS - Apple Support and designate the external disk as its destination.

Big Sur may not be the version it offers. Use the applicable key chord as described in Other macOS installation options. You may, for example, need to install an older version followed by upgrading macOS to Big Sur. To do that, read How to download macOS - Apple Support. Once downloaded to your Mac, install it on the external disk the same way.

... to update my firmware?

That part of your question needs explanation. Mac firmware becomes updated with macOS updates and upgrades.

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Making a bootable HD

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