Disclaimer: Use legacy drivers at your own risk. This post is for educational purposes. Always ensure your hardware matches the driver signature.
If you download the newest driver from Prolific’s website for Windows 10, your device will be recognized, but it will display a yellow exclamation mark in Device Manager with a "This device cannot start (Code 10)" error. u232 p9 driver windows 10
: A legacy version often cited in forums for older "Philips" based U232-P9 units. 3. Installation Steps Disconnect the adapter from your computer before starting the installation. Run the installer Disclaimer: Use legacy drivers at your own risk
The U232 P9 isn't dead—Microsoft and Prolific just tried to kill it. By rolling back to the legacy driver, you can breathe another five years of life into that old adapter. Keep a copy of that v3.3.2.105 installer on a USB stick. You will need it again after the next Windows feature update. If you download the newest driver from Prolific’s
Windows 10’s built-in driver (v3.8.xx and above) will deliberately crash the device if it detects an older revision. This is why your adapter worked fine on Windows 7 but fails on Windows 10.
If you are reading this, you likely have a (Prolific PL-2303) serial adapter in your hand and a Windows 10 machine refusing to recognize it. You’re seeing the dreaded "Code 10" error, or simply a yellow exclamation mark in Device Manager.