TABLE OF CONTENTS


As soon as you connect a PCR2 device it should show up in the Win10 Device Explorer with an assigned COM-Port number.

Note: Device Name could be "STMMicroelectronics Virtual COM Port" or just "PCR2"



Troubleshooting Checklist


Please follow these steps to enable communication with your PCR2 or TCR device

  • Use Windows 10
    Our tools are developed and tested with Windows 10 (64Bit) only. We do not support other systems / OSes.

  • Admin Rights
    Make sure your account does have the rights to install device drivers. Check with your PC Admin.

  • Connect USB cable directly
    Do not use an USB extension cable or USB hub between your PC and the device.

  • Use another USB cable
    Retry with another USB-to-MicroUSB cable as your cable could be broken or of bad quality or does not have the data lines at all.

  • Use another PC
    Please try the same procedure with another PC or notebook.

  • Try with another device
    If you do have another device handy, try the same procedure

Windows USB Driver Issues

If you plug in a device, for the vast majority of Windows users the driver installation just works fine. 


However, for some of our customers the automatic driver installation does not work or an old driver is still installed and needs to be removed. It is definitely not fun to fumble around in the driver hell of Windows. With the Zadig Tool you can remove an old driver, so windows will re-install the recommended USB VCP driver again.


Re-Install WinUSB Driver with Zadig


Zadig is a Windows application that installs generic USB drivers, such as WinUSB, libusb-win32/libusb0.sys or libusbK, to help you access USB devices. It is also useful to uninstall broken drivers.



  • Download Zadig from here: https://zadig.akeo.ie/
  • Open Zadig and choose Options>List All Devices to show all USB devices
  • Connect your device. It should show up in the list
  • Select "USB Serial (CDC)" and press "Replace Driver" or "Upgrade Driver"
  • Check if the device is visible in the Windows10 Device Mangager now