Big Sur Remove Device Enrollment

gistfile1.txt

This works for macOS Big Sur to Disable MDM notifications

Restart in Recovery Mode Restart your Mac then hold down the Command & R keys together until you're in the Recovery Mode menu (Command+R)
Click on Utilities (top menu bar) then select: Startup Security Utility
A 3-choices popup appears: select (No security) (there is no confirmation button to press)
Restart again in Recovery Mode (Command+R)
Click on Utilities (top menu bar) then select Terminal
type in: mount then click enter/return
A list of things will show up once you enter in (mount) in Terminal Write down the disk associated with /Volumes/Macintosh HD (mine was /dev/disk2s5) Note: it's not "/", and it's not /Volumes/Macintosh HD - Data
Next, in Terminal, write: umount /Volumes/Macintosh\ HD
then: mkdir /Volumes/Macintosh\ HD
then: mount -t apfs -rw /dev/disk2s5 /Volumes/Macintosh\ HD
then: cd /Volumes/Macintosh\ HD/System/Library/LaunchAgents
then: mkdir xtemp
then: mv com.apple.ManagedClientAgent.* xtemp/
then: mv com.apple.mdmclient.* xtemp/
then: cd ../LaunchDaemons
then: mkdir xtemp
then: mv com.apple.ManagedClient.* xtemp/
then: mv com.apple.mdmclient.* xtemp/
then: csrutil authenticated-root disable (this will Turn off Signed System Volume SSV)
then lastly: bless --folder /Volumes/Macintosh\ HD/System/Library/CoreServices --bootefi --create-snapshot
 (this will Save the current disk status in the boot snapshot)
Now you can restart your Mac, DEP notification is disabled.