csrutil disable
Restart computer
In the terminal, type
sudo open /Applications/TextEdit.app /System/Library/LaunchDaemons/com.apple.ManagedClient.enroll.plist
change
<key>com.apple.ManagedClient.enroll</key>
<true/>
to
<key>com.apple.ManagedClient.enroll</key>
<false/>
So that the changes take effect
There is no root password (the account is disabled and password randomized). Even after assigning a password and enabling the account, the system does not allow for system integrity protection to be disabled (csrutil disable) in a live running mode. Since users/apps in this mode are not root/admin for the core system paths.