Prolific Usbtoserial Comm Port Version 333114 Driver

Prolific USB-to-Serial Comm Port Driver Version 3.3.3.114: A Complete Guide

The Problem: "Code 10" and Fake Chips

1. Download the driver package (PL2303_Prolific_DriverInstaller_v333114.zip).
2. Unzip the package to a temporary folder.
3. Do NOT plug in the USB-to-Serial adapter yet.
4. Run PL2303_Prolific_DriverInstaller_v333114.exe as Administrator.
5. Follow the on-screen prompts, accept the license agreement.
6. After installation completes, plug in your Prolific USB-to-Serial adapter.
7. Windows will automatically detect the new hardware and use the installed driver.
8. To verify: Open Device Manager → Ports (COM & LPT) → Prolific USB-to-Serial Comm Port.

Cause:

Modern Windows requires signed drivers. Version 333114 may not be WHQL-signed for the latest OS builds. Solution (Temporary): Disable driver signature enforcement.

Safety and Compatibility

If you are currently seeing a "Code 10" error, follow these steps to roll back or manually install version 3.3.3.114. 1. Download and Extract prolific usbtoserial comm port version 333114 driver

Driver Download Section

: Once on the official website, look for a "Downloads" or "Support" section. Here, you should be able to search for the driver by specifying the model of your USB-to-serial adapter and your operating system. Prolific USB-to-Serial Comm Port Driver Version 3

To ensure this specific version is active, you must manually select it in Device Manager: Prolific Usb-to-serial Comm Port Version 3.3.3.114 Download Cause: Modern Windows requires signed drivers

"Code 10" error

As Windows evolved from XP to Vista and eventually Windows 10 and 11, Prolific released newer drivers. However, these new drivers had a secret: they were designed to detect "counterfeit" or "clone" chips. If a user plugged in a cheaper cable with a non-genuine chip, the new driver would strike it down with the dreaded (This device cannot start) or a message saying the chip was "End of Life".