Did anyone try to use an external BT adapter (e.g. the Logilink adapter in the webshop) together with internal wifi?
Maybe that would be a temporary solution for the wifi/BT interference problems with the RPI’s internal antenna (used for both wifi and BT).
@muhackl: sorry for this question: are you sure that no sd card protection is enabled? And do you have the tick within the RPi settings page that bluetooth is enabled (activating the hardware for BT)?