No connection to new Cerberus

ellu Folks

Ye, it’s me again -.-"

I bought me a new FEZ Cerberus Rev. 1.4.
Unfortunately Visual STudio can’t find it.
My system works with my FEZ Hydra boards.

The Cerberus is visible in the “Device manager”.
OS: Win 8.1

I tried to start the FEZ config tool to check which firmware is on my board. Only a error message appears.
But I remember from my Hydra that even with the wrong firmware it tried to load the program on the board and gives then an error about the firmware.
But mine is not visible at all.

What should I check first to solve this problem?

Kind regards,