Regards to my A6 Avant 2018 tech pack the version I have states MHI2_ER_AU57x_p3634
the smart phone interface icon is greyed out on the menu list. Does anyone know if it just requires an update to be enabled/activated? Main dealer job or can VCDS do it? Any help would be appreciated. I contact retrofits Audi but cant justify spending £240 for the service.