As mentioned, you need to use the cable that came with the radio connected to the DEV port. Also in my experience win10/11 are problematic as they seem to keep silently replacing the installed driver with a Microsoft supplied driver. Once i grabbed an old laptop and installed win7 on it i was able to connect just fine. It could have been that i was running win10/11 in a virtual machine on Linux, or it was just win10/11 being dumb. Either way i couldn't get win10/11 to work. Win7 connected to omnirig + HDSDR without issue.
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wicknix