I, currently, have the same problem. Bricked the original ECU because it lost power with the key-off position. I got a replacement from a 1.4 N/A.
These are Gen 2 E78 ECU-s.
This is the original file from the original ECU (i have whole 3mb bin file, too, captured with autotuner)
old_JzcSAzPfDx.png
And this is the new ECU file (also have original 3mb bin file).
new_ol6Y2jMFVE.png
The operating systems are identical, i copied all the segments over from the original file to the new file. I cannot change the VIN.
vin_FQwCl4Go5v.png
I disabled VATS Patch 1 (only one available) and did Write Entire. After connecting the ECU, i can hear the fuel pump prime. I did clutch relearn, but triggering the key does not activate the starter at all.
Reported DTC-s were P0513, which i set to No Error Reported, and then after that P1631, which i also disabled by setting to No Error Reported. Still no cranking at all.
The only one left to do is crank relearn, but the engine needs to be running for that. Am i missing some steps?