If you have the .inf files, you must force Windows to use this specific version:
Right-click your Prolific device and select .
A list of installed driver versions will appear. Look for the older version (e.g., ).
Double-click . Set it to Enabled .
is the "magic" driver because it predates this lockout. It works with both genuine and clone chips. It is compatible with Windows 7, 8, 10, and 11 (64-bit). 🛠️ How to Install and Fix "Code 10"
Before altering your current drivers, download a verified installer package that contains the older Prolific driver versions (such as the 2007 Prolific Driver Installer executable). Ensure you download this from a trusted hardware enthusiast repository or your specific device manufacturer’s website. Step 2: Disconnect Your USB-to-Serial Device
A Prolific USB-to-Serial adapter is essential for connecting legacy serial hardware to modern computers. You might use it to program ham radios, connect network switches, or interface with industrial machinery. However, Windows updates often break these connections by automatically replacing working drivers with newer versions. prolific usbtoserial comm port version 333114 driver
| Step | Action | Expected Outcome | | :--- | :--- | :--- | | | Manual Selection : Use Device Manager to manually select an older driver version. | Driver reverts to a stable version, bypassing newer conflicts. | | 2 | Third-party Tool : Run a dedicated fix utility to automate the reversion. | One-click resolution for many Code 10 issues. | | 3 | Advanced System : Adjust UAC, disable driver signature enforcement, and reinstall. | Overrides system-level security to allow the driver to load. |
The most infamous issue with Prolific adapters is the error in Device Manager.
Resolving Code 10 errors ("This device cannot start") on Windows 10/11 when using older PL2303 HXA/X hardware. If you have the
FAQ (short)
Navigate to: Computer Configuration > Administrative Templates > System > Device Installation > Device Installation Restrictions .
Execute the installer (typically .exe ) to add the driver files to your system. Double-click
Newer Prolific drivers (versions 3.4.x and higher) contain "anti-counterfeit" code that intentionally disables generic or older chips by throwing a Code 10 error. Reverting to version (or the even older 3.3.2.102 ) is a standard community fix to bypass these restrictions. Installation Guide
, providing a stable virtual COM port for legacy devices like ham radios, GPS units, and barcode scanners. Conflict Resolution