Disable startup sound when turning on my Macbook M1 I am looking for a way to turn off that useless sound every time I open / turn on my Macbook.
This is a Macbook Air (M1, 2020) currently on Big Sur 11.0.1
I already tried something without success:

this script:  https://github.com/matteoacrossi/nobootsound
the simple command  &quot;sudo nvram SystemAudioVolume=%80&quot;

Someone can help ???
Thank you !
There is a checkbox for it in System preferences:
https://www.howtogeek.com/700255/how-to-enable-or-disable-the-startup-sound-on-mac/