Prolific Usbtoserial Comm Port Version 333114 Driver Jun 2026

This created a frustrating situation where perfectly functional, older adapters would suddenly show a yellow exclamation mark in Device Manager and fail to start with a "Code 10" error when using the latest drivers.

Version 3.3.3.114 is a legacy driver released before Prolific implemented these strict enforcement mechanisms. Installing this specific version allows older and counterfeit PL2303 chips to function perfectly on modern operating systems like Windows 10 and Windows 11. How to Install Driver Version 3.3.3.114

Method B: Disable Automatic Driver Updates via System Settings

Navigate to the tab and click Device Installation Settings . Select No (your device might not work as expected) . Click Save Changes . prolific usbtoserial comm port version 333114 driver

The Prolific USB-to-Serial Comm Port version 3.3311.4 driver is a reliable and widely used solution for various applications. With its improved performance, enhanced compatibility, and bug fixes, this driver version provides a range of benefits for users. By understanding the features and benefits of this device and driver, users can unlock the full potential of their USB-to-serial converter and ensure reliable communication between devices. Whether you're a developer, engineer, or technician, the Prolific USB-to-Serial Comm Port version 3.3311.4 driver is a valuable tool to have in your toolkit.

Official support for this specific version has been phased out by Prolific, but it is available via reputable hardware manufacturer archives:

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Using incredibly old versions of this driver on modern 64-bit systems can cause system instability. Version 3.3.3.114 is widely considered the most stable release that supports older hardware variations without triggering system crashes.

Compatible with Windows 7, 8, 8.1, 10, and 11 (32 & 64-bit). Legacy Hardware Support:

It is renowned for its reliability on older Windows 7, 8, and early Windows 10 systems, providing a consistent COM port connection. The Prolific USB-to-Serial Comm Port version 3

Alternative chipsets and when to replace

Download the installer file (usually an executable or a ZIP file containing .inf files). Step 2: Disconnect the Internet Disconnect your Wi-Fi or Ethernet network.

Select .

Windows 11 has introduced significant compatibility challenges for older Prolific drivers. Prolific has officially ended support for many of its older chips, including the PL-2303 HXA, XA, TA, and TB variants, on Windows 11. This means that even with the correct driver, these older adapters may not function properly on Windows 11.

Windows 11 may block the 2009 driver because of modern security policies. If this occurs, restart Windows in "Advanced Startup" mode and select option 7, Disable driver signature enforcement , before repeating the installation steps.