Hello Andreas
Please send us a screenshot of your StarGo software "SYSTEM" tab, so we can check if the Firmware version match with the StarGo software version.
Furthermore you can try to perform a new and clean installation of the Install_StarGo_656_B2.exe.
Please note that, in order to work properly, the StarGo should be installed and run on the same administrator privileges level of the software that interact with it via ASCOM driver.
For example: if the N.I.N.A. software it has been installed with administrator privileges, the StarGo should be installed in the same way.
Best regards
Stefano
Avalon Instruments Team