Apple TV is still conecting to a MBM from a school, i have tried to remove it and is still there. What do i do?

I received an Apple TV HD from a friend who got it from a school giveaway. They have not factory reset it. Despite factory resetting the device, it continually connects to the school's MDM profile during setup, displaying an error code 301003. This results in the device being monitored by the school, and my internet traffic is also monitored. I need assistance to permanently remove the MDM profile and restore the device for personal use.