Скачать или смотреть Change the security setting on your MacBook to boot from external USB drive

How to change the setup security setting on your MacBook to boot from external drive.
If you have MacBook Pro, MacBook Air, iMac, Mac Mini with T2 Intel chip set then you have to change the security setting for you Mac to be Able to boot from external drive.
So If you try to downgrade your MacOS for instance Big Sur to Catalina, Mojave or High Sierra
1- You have to create a bootable USB or disk for that MacOS which you can find on this video :
How to create bootable disk for MacOS - Step by step! :
   • How to create bootable USB disk for MacOS ...  

2- Then change the security setting as showing in this video to be able to boot from that external drive or thump drive.

-In this video will give you an overview what things can you do in MacOS Utility as well.

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