¶ How to turned off Secure Boot on the Apple computer with the Apple T2 Security Chip
Open Startup Security Utility
- Turn on your Mac, then press and hold Command (⌘)-R immediately after you see the Apple logo. Your Mac starts up from macOS Recovery.
- When you're asked to select a user you know the password for, select the user, click Next, then enter their administrator password.
- When you see the macOS utilities window, choose Utilities > Startup Security Utility from the menu bar.
- When you're asked to authenticate, click Enter macOS Password, then choose an administrator account and enter its password.
- Select the options marked on the screen and save the settings:
How to turned off Secure Boot on the computers other than Apple