Windows 10 Prolific USB-Serial Driver Issue
September 16,  2015
by: Conrad Nerdahl – WA6KUE

Windows 10, Baofeng, and Chirp

The Windows 10 installation/upgrade includes a newer version of the Prolific USB-Serial driver.  This is the interface driver software that translates many USB to Radio adapters via a Com-Port (for lack of a more complex explanation).

There is one problem.  The newer drivers create a false positive on the serial interface and throw the radio into a transmit mode upon connection to the PC.  This prevents any updates to the radio using Chirp software and forces your radio into an uncontrolled (undesired) transmit state.

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.

As a resolution to this, the solution is to roll back the driver to a 2007 version.  And, the instructions can be found on the Miklor web site –

At this site, follow the directions to reverse the driver from a newer version to the legacy version and you’ll once again be able to program your radio using the Chirp software.