BT microphone stuck at lowest quality (sennheiser momentum wireless, windows 10)

Bought BT-headset. Using windows 10 and bluetooth found it immediatly and got it running. But the microphone is stuck at lowest quality (telephone).

got told to try disabling as much as possible under bluetooth services tab. I unchecked everything except "Handsfree telephony" Didn't work.

Any ideas?

Images

Headset Sennheiser momentum wireless (www.sennheiser.com/momentum-wireless/)

Bluetooth/Motherboard Gigabyte GA-Z87N-WIFI, Socket-1150 (www.gigabyte.com/products/product-page.aspx?pid=4600)

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