VCDS can definitely recode Motronic 7 ECUs (and others) - I've done it myself on V8s and TDIs. However, in order to recode it you have to log in to the ECU with a specific code. Only then will it accept the new code. There's nothing in the W12 documentation about logging in, which surprised me, but it may simply be an oversight.
I will have a look and see what the code is for the V8. As both ECUs are ME7.1 it might be the same on the W12.
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