Cannot perform 1.5 firmware update UR816C - device not found

Installed the latest 1.5. Tools and driver. Windows detected UR816c in HA mode in device panel.
But firmware update reports device not found, dspMix as well.
Tried with IoS, same result. Have also UR22C, which connected to ios without any problems.

Any help welcome.
Best Regards
Stanislav