Hi @LLWDTP 1. Go to Windows Device Manager, USB/ USB Serial Converter/ Properties/ Advanced and Make sure the "Load VCP" is unchecked. If this "Virtual Com Port" is checked some other driver or application may open and keep it busy. Reconnect the device and see if it is detected by WF app or programming works. 2. Under Update Tab try "Update Driver" from Windows update or from FTDI site: https://www.ftdichip.com/Drivers/CDM/CDM v2.12.28 WHQL Certified.zip https://www.ftdichip.