I have been an owner since 2016 of a model S and assumed my car was MCU1 and AP-1 car. My browser works great, yes no video etc, but it works well. Fully updated to latest version-2019.36.2.1ea322ad. Of course no Sentry etc for later versions of Model S. SO the question remains to those who definitely know the full accurate answer to determining exactly which MCU one has and which AP. Thanks for your answers in advance.