I've solved it by myself and I wonder how dumb I have been to ask for such a stupid thing...
Sorry: recently I'm really losing portion of memory by myself.
The problem was connected to a recent Motherboard change... and I made the mistake to connect the OM to an USB 3.1 port...
Well, I've been able to get control of my OM keyboard again after switching it to an USB 2.0 port instead.
It was indeed not a driver which was needed: only a more reliable USB door.
Just for anyone else considering before getting mad...
