Macbook Pro Core I7 A2251 EMC3348 Help Remove MDM

[MICHAEL_2013]

Good afternoon. My client brought me a Mac A2251 EMC 3348 that he bought at a sale. The computer is completely iCloud-free, but it came with MDM installed. He has tried contacting the company that provides the MDM in every way possible, but they are unwilling to offer a solution. The device is:
Model A2251 EMC 3348. Serial Number: C02G54CZML85
Apple MacBook Pro Core i7 2.3, 13" 2020, 512 GB SSD, 16 GB RAM.
I've tried changing the serial number of the SoC ROM MX25U3235F, but it hasn't worked:
C02G54CZML84 only works up to Monterey.
C02G54CZML86 doesn't work (I didn't try it with Monterey).
C02D54CZML85 doesn't work Black Screen.
Additionally, I haven't been able to enter DFU mode. Could someone help me? Thank you very much.

[ibo]

Changing serial number must work, change it completely not one nr in the end

[MICHAEL_2013]

Good afternoon. My client brought me a Mac A2251 EMC 3348 that he bought at a sale. The computer is completely iCloud-free, but it came with MDM installed. He has tried contacting the company that provides the MDM in every way possible, but they are unwilling to offer a solution. The device is:
Model A2251 EMC 3348. Serial Number: C02G54CZML85
Apple MacBook Pro Core i7 2.3, 13" 2020, 512 GB SSD, 16 GB RAM.
I've tried changing the serial number of the SoC ROM MX25U3235F, but it hasn't worked:
C02G54CZML84 only works up to Monterey.
C02G54CZML86 doesn't work (I didn't try it with Monterey).
C02D54CZML85 doesn't work Black Screen.
Additionally, I haven't been able to enter DFU mode. Could someone help me? Thank you very much.

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SOLVED: I had another identical motherboard for spares. I tried installing the MX25U3235F on the motherboard with MDM, and the computer automatically booted into DFU mode. I restored it with Apple Configurator 2, then updated it with CMD+R. It's working perfectly now, 100%. Issue closed. Thanks for the help.