It does seem like it is ridiculous. A lot of the problems are because we fly certified planes and well, you know - it’s an aircraft.
You don’t have EMax, that is an Avidyne engine monitoring system. Arnav called it EMM (IIRC). EMM and EMax are not compatible. The issue is you need an Sensor Interface Unit (SIU) for the Avidyne since the EMM one won’t work. They are expensive and in short supply. The Stormscope will play on the Avidyne. In fact more will play on the Avidyne than will on the Arnav. It is a far superior product, just a little issue on engine monitoring That happens to be expensive.
The Arnav story is a long convoluted one. Cirrus originally installed them and rather quickly dropped them in favor of Avidyne. Because there are so few out there many issues have cropped up. The data was not any longer updated since subscriptions are a loosing proposition (that started years ago). So, even if the hardware was repaired it has limited functionality. Trust me you will be much happier with almost anything you put in there. But Sagem has a really poor hand dealt to deal with And did until a little while ago support Them.