I am trying to boot from an external device and it is asking for an administrator password. The machine is new and didn't have a password so I created an admin password and it still won't allow me to update the security settings for startup disks.
I have cloned my old MacBook (2016 MacBook Pro 13") and I am trying to restore on to my new MacBook Pro (2018)
Best Answer
I was able to move past this by creating another account (called admin) then switching between my account and the admin account. Once I did this I was able to open the dialog box and move forward.