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windows-8.1driver

how to update prolific USB to serial driver?

I have a device (R31D) that read RFID card with USB port(convert serial port to USB port). When I connected it to my computer, ( windows 8.1 - drivers update - X64 ) , It does not work .
When I checked it in device manager it shows small yellow alarm on Prolific USB-to-Serial port(COM3). and when I want to connect to my device with putty. show this error : unable to open connection to COM3. Unable to open serial port.

Solution

  • solved the problem.
    First should remove all drivers that related to prolific
    second install old version of prolific (I used 2009 v).
    then it works.