You can flash the Nano with an ST-Link interface.
I bought one for $3 from Aliexpress - works great:
Also avail on Amazon.
I had a similar issue as you're having but only after I had done some soldering on the board - a small ball of solder was stuck across the data lines at the USB connector.
Just follow the instructions for the driver here:
/g/nanovna-users/topic/34550986
On Friday, March 4, 2022, 01:18:09 p.m. EST, Brady Nelson <tbradynelson@...> wrote:
No luck with a new USB cable, still showing up as "Unknown USB Device (Device Descriptor Request Failed" in device manager.
I'm wondering if the firmware can be flashed via serial somehow? I think I may have a USB-serial adapter somewhere.
I couldn't figure out how to load the STM driver into Zadig to install the driver, just the generic usb drivers in the dropdown.
