Plug your Prolific USB-to-Serial cable into your computer. Verify in Device Manager: Right-click the Start button and select Device Manager . Expand Ports (COM & LPT) .
Prolific USB-to-Serial COMM Port Version 3.3.3.114 Driver: Complete Guide
Because Windows often automatically installs the latest (sometimes incompatible) driver, a manual rollback is often required: Prolific USB-to-Serial Comm Port (COM8) Driver for Zepto
Wide Compatibility: Works with PL-2303H, PL-2303HX, and PL-2303HXD chipsets.Legacy Support: Perfect for Windows XP, Vista, and Windows 7, but also functions on Windows 10 and 11 when installed manually.Standard Baud Rates: Supports data transfer rates from 75 bps to 6 Mbps.Reliability: Known for stable performance in industrial automation, GPS receivers, and networking console cables. How to Install Prolific USB-to-Serial Driver 3.3.3.114
Here is a quick summary of the steps to resolve the notorious Code 10 error: prolific usbtoserial comm port version 333114 driver
Newer drivers (version 3.4.x and higher) check if the PL-2303 chip is genuine. If it is not, they purposefully cripple the device. 3. The 3.3.3.114 Advantage
If Windows still assigns a newer driver:
Because modern Windows environments automatically pull the latest incompatible driver, you must explicitly force the system to install and target version 3.3.3.114. Step 1: Clean Out the Conflicting Driver Disconnect your USB-to-Serial adapter from the PC. Press and select Device Manager .
Check the box that reads "Attempt to remove the driver for this device" and click Uninstall . Step 2: Extract and Seed Version 3.3.3.114 PL2303 issues (Prolific USB to Serial Drivers) Win 11 Plug your Prolific USB-to-Serial cable into your computer
The root of this issue almost always traces back to a specific driver version: (often dated around 2009).
If you have the .inf files, you must force Windows to use this specific version:
The (released circa 2009) is a specialized software component primarily used to resolve compatibility issues with older PL-2303 chipset variants on modern Windows operating systems. While newer drivers exist, this specific version remains a critical tool for users of legacy or "counterfeit" hardware that the latest official drivers often block. The Role of Version 3.3.3.114
Click on the menu at the top and select Show hidden devices . Expand the Ports (COM & LPT) segment. Prolific USB-to-Serial COMM Port Version 3
Prolific Technology Inc. periodically updates its USB-to-Serial drivers to:
This driver has become essential across a wide range of fields. Embedded systems developers use it to flash firmware onto microcontrollers, network engineers rely on it to configure Cisco routers and switches through their console ports, and industrial automation technicians depend on it to communicate with Programmable Logic Controllers (PLCs). It is an indispensable tool for any hardware professional, allowing direct access to low-level device control [0†L4-L7].
To prevent Windows from "updating" your working 3.3.3.114 driver to a broken version:
This report documents the deployment and compatibility characteristics of Prolific driver version . This driver is intended for legacy and industrial USB-to-RS232 converter cables utilizing the Prolific PL2303 chipset. Version 3.3.3.114 is identified as a post-2012 driver , which includes Prolific’s intentional code to block counterfeit or non-certified PL2303 chips (particularly the older ‘HXD’, ‘RA’, and non-‘GC’ variants). Users with genuine, newer revision chipsets (PL2303GC/GS/GH) should experience normal operation; however, legacy devices may fail with Error Code 10 (Device cannot start).
Installing the 3.3.3.114 driver can be approached in several ways. Below are two of the most effective methods.