I have programmed OpenSDA v2.1 CMSIS-DAP binary in k22f MCU and installed mbed serial port driver in my PC. Then I downloaded my program in kw40z MCU via SWD MKW40Z connector using j-link in IAR Embedded workbench because CMSIS-DAP debugger mode is not working. After that I can't able to see mbed serial port driver in my PC Device manager. So I erased MKW40Z MCU and also restarted my PC. But still it's not showing mbed serial port. Please give me a solution for this. Need to load any default bin files in kw40z MCU for enable virtual COM port?