Sorry, I have found that the German forums use acronyms for everything:What does MiC mean?
My MY has been on 2021.3.104 since I bought it on July 22. Also shows 2021.4 as older in revision history.
SuC = Supercharger
SeC = Service Center
MiF or MiUS = Made in Freemont/US
The problem is going to be when the Berlin factory comes online and they have to count all their cars in multiples of 1024 (MiB)