I have a Doser 2 that's still on firmware 1.02 but I cannot establish the USBVCOM connection to update it.

I installed GHL control center 1.084 and did the manual installation of the driver on a Windows 7 PC and on different PC with Windows 10. I have uninstalled and reinstalled. I have tried a different USB cable.

Is there any way to resolve this or do I have a Doser 2 that's defective and can't be updated ?