So no one knows? I also want to add spare key to F10 CAS4 ews4 not active. Tested huf5662 keys on F10 lci 2016y. + comfort access, no problem at all. What about previous bmw f10 series models? Interesting, because F10 from 2011 to 2013y keys was made by continental and after ~2014y they used huf. Never tested huf keys on older f10 with Comfort access, want to know or all funcions, especially comfort access will work if original key was continental and I will use huf key?