@Dominik-Paľo Hm, it seems that there is problem in Windows 10 TP > http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_devices/windows-10-serial-usb-problems/438de66f-7294-4c06-b4fb-89b45d005ca0?tab=question&status=AllReplies&status=AllReplies%2CAllReplies