Seat Ibiza 2011 1.2 TDi DTC 16239 - ECM Incorrectly Coded

I've just bought a Seat Ibiza 2011 1.2 TDi Ecomotive as my personal car, was sold as non runner due to immobilizer problem. I thought be not too difficult problem and bought the car. The seller assured me he had not tampered, remap attempt ect, (although humans do tend to lie a lot to get rid of an item they deem to be broken) although TBH I'm more inclined to believe someones been meddling with things they know nothing about. Got the car home and scanned with VCDS, and came DTC 16239 - Engine Control Module Incorrectly Coded. Looks to be the main problem, although a few other DTC's are stored, but now cleared those. How do i go about troubleshooting and rectifying? Main problem is this: Weird symbols for ECM serial number and all zeros for coding, I did look in VCDS engine, then used long coding helper to select cars params/bytes, after click do it, i get: Error 31, Out of Range.

A great member here gave me some advice, which I'm not doubting at all, saying this could probably resolved via online ODIS, but I had a member on another forum where I also asked about this issue, PM me saying ODIS would not fix this, saying that ODIS couldn't resolve this possibly. I trust the member from this great forum more than a random stranger PM me, but it said some confusion on how to proceed, so I'd like if someone could give a definite answer before I try and purchase a 5054A used original once located and pay someone to remote online ODIS if it was gonna be a fruitless venture. And what are my options other than dealer robbery, ie what tools needed, and I could try and find someone here in UK?

VCDS log scan:

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Address 01: Engine (J000-CFWA) Labels:. 03P-906-021-CFW.clb
Part No SW: 03P 906 021 AB HW: 03P 906 021 BC
Component: R3 1.2l TDI H06 9979
Revision: 12005001 Serial number: Û‡Ï¿ƒ¾Ü÷žþ½ÿ©
Coding: 00000000000000000000
Shop #: WSC 00000 000 00000
ASAM Dataset: EV_ECM12TDI03103P906021AB 001020
ROD: EV_ECM12TDI03103P906021AA.rod
VCID: 68632AB3055F8C5DFD-803C

4 Faults Found:
16239 - Engine Control Module Incorrectly Coded
P1612 00 [191] - -
MIL ON - Confirmed - Not Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 2
Mileage: 131599 km
Date: 2022.03.19
Time: 03:23:07

Engine RPM: 0.00 /min
Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 9 °C
Intake air temperature: 15 °C
Ambient air pressure: 1020 mbar
Voltage terminal 30: 12.304 V
Unlearning counter according OBD: 0
OBD Driver demand indicated torque: 0 %
Communication status of data bus 1: CAN Bus ON
Cruise Control System (CCS): status: 00000000
Terminal 15 status: On
Gear Ratio: 0
Sensor for engine block temperature: raw value: 9 °C