Reset audio element in Levorg

A question to the Tecknixe in the forum: With my Levorg the smartphone ( Motorola XPlay) can not be screwed up i. The hands-free device integrated. Strangely enough, it worked at the beginning but sometimes already. The contacts were taken over, but a connection was not possible. Then I threw everything out again and tried to install again. Then there was nothing more. Installation and pairing worked, but when trying to take over the contacts My dealer tried unsuccessfully to reset the device. Now, in his opinion, only a short battery could help to “null” everything. But a “manual reset” would have to work as well. After that, all transmitter settings would have to be changed, but that wouldn’t be the problem. I just want to have the hands-free device active at last. Does anyone know advice? Gruss JockelMR