If you have the chance to try it with Linux (or know a friend who runs Linux and try to connect to the dev port), we can try to rule out Windows vs the hardware (USB cables, X6100 USB connector, etc).
In Linux the moment you connect that USB cable to your PC you should see several new messages (use 'sudo dmesg -T' to see them) similar to these:
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[Sun Mar 23 15:20:57 2025] usb 3-4: new high-speed USB device number 12 using xhci_hcd
[Sun Mar 23 15:20:57 2025] usb 3-4: New USB device found, idVendor=05e3, idProduct=0608, bcdDevice=85.38
[Sun Mar 23 15:20:57 2025] usb 3-4: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[Sun Mar 23 15:20:57 2025] usb 3-4: Product: USB2.0 Hub
[Sun Mar 23 15:20:57 2025] hub 3-4:1.0: USB hub found
[Sun Mar 23 15:20:57 2025] hub 3-4:1.0: 4 ports detected
[Sun Mar 23 15:20:57 2025] usb 3-4.2: new full-speed USB device number 13 using xhci_hcd
[Sun Mar 23 15:20:57 2025] usb 3-4.2: New USB device found, idVendor=0d8c, idProduct=0012, bcdDevice= 1.00
[Sun Mar 23 15:20:57 2025] usb 3-4.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[Sun Mar 23 15:20:57 2025] usb 3-4.2: Product: USB Audio Device
[Sun Mar 23 15:20:57 2025] usb 3-4.2: Manufacturer: C-Media Electronics Inc.
[Sun Mar 23 15:20:57 2025] input: C-Media Electronics Inc. USB Audio Device as /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4.2/3-4.2:1.3/0003:0D8C:0012.000A/input/input42
[Sun Mar 23 15:20:57 2025] hid-generic 0003:0D8C:0012.000A: input,hidraw0: USB HID v1.00 Device [C-Media Electronics Inc. USB Audio Device] on usb-0000:00:14.0-4.2/input3
[Sun Mar 23 15:20:57 2025] usb 3-4.4: new full-speed USB device number 14 using xhci_hcd
[Sun Mar 23 15:20:57 2025] usb 3-4.4: New USB device found, idVendor=1a86, idProduct=55d2, bcdDevice= 4.44
[Sun Mar 23 15:20:57 2025] usb 3-4.4: New USB device strings: Mfr=0, Product=2, SerialNumber=3
[Sun Mar 23 15:20:57 2025] usb 3-4.4: Product: USB Dual_Serial
[Sun Mar 23 15:20:57 2025] usb 3-4.4: SerialNumber:
[Sun Mar 23 15:20:57 2025] cdc_acm 3-4.4:1.0: ttyACM0: USB ACM device
[Sun Mar 23 15:20:57 2025] cdc_acm 3-4.4:1.2: ttyACM1: USB ACM device
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Once it is connected, you can also run the command 'lsusb', and in the output you should see a couple of lines like these:
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Bus 003 Device 013: ID 0d8c:0012 C-Media Electronics, Inc. USB Audio Device
Bus 003 Device 014: ID 1a86:55d2 QinHeng Electronics USB Dual_Serial
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Hope this helps,
Franco
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