<iframe width="580" height="385" src="https://www.youtube.com/embed/GQkOIw-6qQs?rel=0&autoplay=1&autoplay=1&modestbranding=1" frameborder="0" allowfullscreen></iframe> <br>This video is about Dealer Tech Critiques Downgrade your Mac from 10.15.1+ Hyperlink : https://www.imore.com/how-downgrade-macos#boot <br><a href="https://www.youtube.com/watch?v=GQkOIw-6qQs">source</a>