Voice control on convertibles

John_A5

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Hi All,
I have a 2015 A5 special edition plus convertible which has the voice activation button on the steering wheel on the right stalk. When I press the button, "not installed" appears in the centre display.
I've read on a few forums that this has been disabled from factory on convertibles for reliability issues. My question is:

1. with it being a special edition plus, it should have this installed and just deactivated?

I assume something like carista can enable this?

Any help would be grateful