1. Unzip stm32_VCP_V1.4.0_Setup£¬run the VCP_V1.4.0_Setup.exe
2. Open the C:\Program Files (x86)\STMicroelectronics\Software\Virtual comport driver\Win7 folder£¬run dpinst_amd64.exe
3. Plug in QR20 to your PC via USB to see if the PC can automatically recognize it, if does then the installation is completed.
4. If it is not recognized, please unzip the vcp_driver folder
5. Replace and overwrite the usbser.sys file c:\windows\system32\drivers\usbser.sys, Copy the three files [mdmcpq.PNF mdmcpq.inf stmcdc.inf] to c:\windows\inf\
6. Uninstall the original device with the yellow exclamation mark, plug the USB in again, installation complete.
