Well, what reference dates? I'm talking about having an extra ECU for any interactions with the dealer as well. You bring it in for service, swap it out, as long as the ECU isn't getting any OTA updates, it would work fine. And I doubt the ECU would get OTA updates as it's too critical that if something weren't to take properly, there'd be bigger problems for them.
Anyways, it's funny how the keyboard experts are all silent on this particular method
Lol