Device Re-enrollment

Non-removable MDM profiles cannot be officially removed without doing a full system wipe. This is a problem when you restore a system from Time Machine after you enroll it into the MDM, as the MDM will break, leaving you unable to re-enroll the machine.

Here's how to remove a non-removable MDM profile

1. Boot the Mac into Recovery Mode (hold down the power button)
2. Go to the Utilities menu and open Terminal and type: csrutil disable.
   This will disable SIP (System Integrity Protection).
3. Reboot into the OS.
4. Open terminal and type:
   
   

sudo rm -rf /var/db/ConfigurationProfiles/*
sudo mkdir /var/db/ConfigurationProfiles/Settings

sudo touch /var/db/ConfigurationProfiles/Settings/.profilesAreInstalled

1. Reboot.
2. Boot the Mac into Recovery Mode (hold down command+R during startup).
3. Go to the Utilities menu and open Terminal and type: csrutil enable. This will re-enable SIP.
4. Reboot into the OS.
   
   

The profile will be now removed and you will be able to re-enroll the Mac to your MDM.

Source : https://graffino.com/til/UmkCdmEx7v-remove-a-non-removable-mdm-profile-from-macos-without-a-complete-wipe