How to change boot drive to usb on single boot Manjaro

i am running single boot Manjaro Linux on a macbook air 2012, need to sell computer so want to re-install mac osx. have mounted osx on a mobile usb drive but cant figure out how to change starting boot to usb to be able to access mac installer.

all help welcome, ty

I'm traveling.
And I do not have my wife's macbook to try.

I think the sequence was the following:

  1. Plug the USB drive

  2. Turn on or reboot the Mac

  3. Hold down the "Option" key until you see the Startup Manager.

  4. select the USB drive and press Enter.

@moby For Mac users, these are great page in times of need. :wink:

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