Installing the Backdated Prolific PL-2303 Driver

(compliments of

Important Notes

-   Chipsets:
Due to Prolific USB/Serial chip 'clones' found in generic USB programming cables, an older driver is required in lieu of the one supplied by Windows.

Note: Cables with
FTDI chipsets are compatible with all Windows drivers.

-   New Prolific Drivers may give a FALSE Positive: (6-2015)

Windows will now load the newest Prolific driver when inserting your cable. A Yellow Triangle may not always appear in Device Manager as described below, however, when you insert the cable into your radio, the transmitter will turn on.   More detail can be found Here.

If this occurs, you Must backdate your driver to
     (Go directly to
Install Drivers)

-   Windows 10 Upgrade:
If you recently upgraded to Win10, Windows will automatically update your Prolific driver. You will need to reload Prolific back to your PC.

If Windows tries to update this driver in the future, you must turn off automatic updates.


-   Prolific Drivers:
Prolific recommended for Vista, Win7 / 8 / 10  (32/64 bit)  Site1  (32/64bit)  Site2

If you are using Win XP, the Prolific driver will run with no issues.
This driver for Win XP can be found here:


System Requires 32/64 bit  Windows Vista / 7 / 8 / 10

1) Create a work folder (New Folder) on your PC.

2) Download the Prolific driver file and save it to the work folder. (32 bit)  Site1 (64 bit)  Site2      (32/64 bit)

3) Remove the USB programming cable from your PC.

4) Double-click the file that was saved into the work folder and follow the prompts until it is completely installed.

5) Plug the USB programming cable into the USB port of your PC.
You should see a balloon popup that says "Installing device driver software"
Installing Device Driver

A few seconds later you will get a balloon popup that says
          "Device driver software was not successfully installed"
Installing Device Driver

6) Launch Device Manager.

          [  Start  |  Right-click Computer  |  Properties  |  Device Manager  ]


You will see one of the following errors in Device Manager.

In 'Other Devices' the 'USB-Serial Controller' is proceeded by a YELLOW warning.

In 'Ports (COM & LPT)' the 'Prolific USB-to-Serial Comm Port (COMx)' will appear.


7) Right-click on the entry with the error to open a window and select
          "Update driver software..."


8) At the first Update Driver Software prompt, select
          "Browse my computer for driver software".


9) At the second Update Driver Software prompt, select
          "Let me pick from a list of device drivers on my computer"


10) At the third Update Driver Software prompt, scroll down and select
          "Ports (COM & LPT)".


11) At the fourth Update Driver Software prompt, select
          "Prolific USB-to-Serial Comm Port Version: [7/31/2007]".


You should get a prompt saying that the driver was installed successfully.
You should now see a properly installed Prolific driver in Device Manger.


You can check that the correct version is installed by double-clicking on the Prolific entry in device manager and selecting the Driver tab.

The driver version shown should be v3.2.0.0


12) Remove the USB programming cable from your PC and then plug the USB programming cable back in.

13) (Optional) Reboot your computer.




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