Hi,
The osmc dongle comes with an auto configuration setup, which in this case seems to have failed. Try:
sudo cp /lib/firmware/mt7610u_sta.template.dat /lib/firmware/mt7610u_sta.dat
And reboot. You should now have a working a connection, if not or not quite the expected speed; Some further tweaking can be done:
I think setting the wireless mode to 13 & setting country code should be enough.
Thanks Tom.