Re: Not recognised.
This is the first paragraph from the support page at NWDR: http://nwdigitalradio.com/thumbdv-and-dv3000-resource-page/
(there is more online).....
Windows Users (ThumbDV™)
When you plug in the ThumbDV it should appear as a new serial port under Device Manager, note which COM port it is on, and remember new ThumbDV™ are at 460800 baud (older models are at 230400). There is a very simple test program for verifying operation under Windows. It can be found at https://nw-digital-radio.groups.io/g/ambe/files/ — it is called ThumbTest.exe