Hi @Mohamed_AYEDI wasn't able to create a pull-request (I'm not a contributor), so I created a bug report with a proposed solution.https://github.com/eclipse-threadx/usbx/issues/171  

We had the same problem, USB-ECM works great under Linux and OSX, but it doesn't work under Windows (it can be solved with the driver, but the problem demo version which is free is works only for 30 minutes). Default STM32 RNDIS only worked under Win...