Click if you need to change the COM Port Number to match your software requirements.
In Device Manager, right-click the device -> Properties -> Driver tab -> Roll Back Driver .
For Windows 10 users, it is best to source drivers directly from the manufacturer or verified repositories to avoid compatibility issues. u232 p9 driver windows 10
Alternatively, look for a tool named PL2303 Legacy Driver Updater (often found on GitHub). 2. Manual Installation (Via Device Manager)
If you have already installed the driver package, look for an older version (e.g., from 2015 or 2017) rather than the most recent one Windows automatically picked. Confirm the Port Click if you need to change the COM
No, it likely is not broken. In the vast majority of cases, "Code 10" on a PL2303 device indicates a driver issue, not a hardware fault. It typically means the driver you are using has detected a signature it doesn't like. Installing an older driver like version 3.3.2.102 almost always resolves it.
If your cable shows VID 0711 , search specifically for the and repeat the manual installation steps detailed in Method 1. Troubleshooting Common Post-Installation Issues The Adapter Disappears or Changes COM Ports Alternatively, look for a tool named PL2303 Legacy
Windows 10 will aggressively overwrite your manual changes if it is connected to the internet. Unplug your Ethernet cable or disconnect from your Wi-Fi network before proceeding. Step 3: Uninstall the Current Driver Right-click the and select Device Manager . Expand the Ports (COM & LPT) section.
Because these chips were designed during the Windows XP and Windows 7 eras, Windows 10 does not always include the necessary driver architecture in its default update catalog. This results in the frustrating "Unknown Device" or "Device Descriptor Request Failed" errors in your Device Manager. Step-by-Step Installation Guide for Windows 10
Select . Uncheck "Show compatible hardware".
The "U232-P9" is not a brand name but a found on many generic USB-to-Serial (DB9 male) converter cables. Internally, it typically uses one of three legacy chipsets: