This is the most common error for the U232 P9 on Windows 10. It usually means Windows overrode your working driver with an incompatible, newer version.
Many legacy software programs only support COM ports 1 through 4. If Windows assigned your adapter to COM5 or higher, right-click the device in Device Manager, go to Properties > Port Settings > Advanced , and change the COM Port Number to an open lower slot.
USB Serial Adapter Drivers (Prolific) - Plugable Technologies
Extract the downloaded ZIP folder to an easily accessible location, like your Desktop. Step 2: Access Device Manager u232 p9 driver windows 10
If you plug the adapter into a different USB port, Windows 10 may assign it a completely new COM port number, breaking your software configuration.
Before doing anything, correctly identify your chip. This prevents you from wasting time on incorrect solutions.
The U232 P9 is a legacy USB-to-Serial adapter often used to connect industrial equipment, networking hardware, or DIY electronics to modern computers. Because these devices often use older Prolific or proprietary chipsets, getting them to work on Windows 10 can be tricky. This is the most common error for the U232 P9 on Windows 10
What are you trying to connect to the serial port?
) before plugging in the adapter to ensure the system recognizes it immediately. Connect the Hardware: U232-P9 adapter
Sometimes, multiple incompatible drivers conflict. Remove them all before reinstalling the 2012/2013 driver. If Windows assigned your adapter to COM5 or
Buy a new adapter based on the FTDI FT232 chip. FTDI maintains perfect Windows 10 compatibility and even provides an official driver tool.
Armed with an understanding of the problems, let's move to the solutions. Follow these methods sequentially, starting with the simplest and safest.
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