The way to install iGO/Primo on any Medion is in fact very simple when you know how. I have a howto (made by Yurbuh Tuggly) at my place, not here.
That manual must be followed because Medion software enables the hardware functions (sound, gps, video, TMC, ...) in a consecutive programs cycle. Interrupt that cycle and the device is not functional. But Medions aren't hard to "unlock"

How is explained here : general-discussions-about-igo-core-f87/medion-e4460-how-set-tmc-and-work-igo8-and-pri-t14113.html?hilit=medion