Look for a "Prolific PL2303 Legacy Driver" or a specifically signed driver for version 3.3.x or 3.4.x.
Hold the Shift key while clicking Restart in your Windows Start Menu. Go to Troubleshoot > Advanced options > Startup Settings > Restart . Upon reboot, press 7 or F7 to choose Disable driver signature enforcement . Reinstall the driver immediately. COM Port Conflicts u232 p9 driver windows 10
The U232-P9 is a popular, affordable USB-to-Serial (RS-232) adapter, which is essential for connecting modern laptops (that lack serial ports) to older devices like GPS receivers, modems, routers, and scientific instruments. While you can find these adapters online for just a few dollars, the challenge often begins when you try to use them with modern versions of Windows. Users commonly report the device appearing as Prolific USB-to-Serial Comm Port in Device Manager, but with a prominent yellow exclamation mark indicating it isn't working. Look for a "Prolific PL2303 Legacy Driver" or
Do not use generic driver updater software. They often bundle malware or incorrect files. Open your web browser. Upon reboot, press 7 or F7 to choose
If you have already installed a driver but are still receiving a "Device cannot start (Code 10)" error:
To implement these features, you can leverage the following technologies:
First, You can find the necessary legacy driver file, often named PL2303_64bit_Installer.exe , from various community-maintained sources or archive sites. For safety, always scan any downloaded file with updated antivirus software.