When I first picked up the car I had rear tail light errors (as expected because I have Mk7.5 tails), no big deal. Get home and fire up VCDS (save new BCM auto-scan and ad-map) and go to make those changes, but notice that my new BCM adaptations don't match my car's original adaptations, which is weird. I make a few changes then decide I should do some digging. Walk away from the car and the key fobs won't lock/unlock the car. So back to the dealer for them to fix that, also tell them the adaptations have not been done.
This time when I pick up the car I'm
concerned so I turn on the headlights, several light errors pop up, front and rear. I had my laptop so I check a few adaptations values and they still don't match my factory config. Tell them to keep the car and fix it. Several days later they call and say the long coding matches and that's all they can do

. I say they need to do adaptations (it's clear the SA doesn't know what I'm talking about) but I am told the "guy that's good with this stuff" will be moving over to work on my car next... okay.
Get a call a couple days later and I am told that they need to me to reinstall all my stock equipment (headlights, tail lights, infotainment, dash) for them to troubleshoot the various errors

. I tell them I don't want any troubleshooting done, just need them to do the adaptations and that once they match how my car was delivered I will worry about any remaining errors. The tech then tells me that some errors are "just going to be there" since the new BCM isn't the same part number as the one that came in my car. I respond that the part number that came in my car cannot be ordered, and that the part number in there is now the replacement, per ETKA (which they looked up and ordered). They say they'll get with VW engineering and get back to me.
To help them along, I send the html comparison of ad-maps from my car, out of the factory versus the new BCM. At this point I've already done some digging through it and see that among other things, my new BCM adaptations match a car with lighting package, some type of LED tail light, heated seats, fog lights, personalization menu, etc. The tech calls and says he can manually change all the adaptations to match my old ones, using VCDS (since the official VW tool won't let them manually change adaptions, which makes sense). This offer comes with a 6 hour labor charge. I decline on the grounds that adaptations are part of the BCM replacement, and knowing it will likely take more than 6 hours for one person to go through 2,500+ adaptations. I'm now 2 weeks and in, and
annoyed, to put it lightly. I not so politely told them to follow the guided function for replacing a BCM, as if a customer's new car had a BCM failure.
The SA wants to have a conference call with VW engineering so I can explain to them what I want done. The SA doesn't think it's something they can do. I can't make the conference call time so the tech says they will call their buddy at the Audi dealership and see if they can help. Next morning I get a call that the car is ready. Go pick it up, adaptations have finally been done.