In Internet googled something and answers found:
There is a firmware compatibility issue before in connection with newer motherboards for AMD processors and their MX / FX chipsets!
Corsair has been a software update in the beta testing phase and will probably publish this sometime.
This update then takes a firmware update on the keyboard in front of which this is then also found in the BIOS and should then function properly under Windows.
So it heist wait until the update is out and then hope that everything works as it should.
Hence my recommendation to all the one about 2 year old or younger AMD computer to call their own: Do not buy but switch to another product or at least as out push to buy about 6 months, in the hope that by then the software update is out, or a new batch delivery with fixed second firmware commercially.
A disappointed buyers.