Prolific Usbtoserial Comm Port Version 333114 Driver May 2026

The Prolific USB-to-Serial Comm Port Driver (Version 3.3.3.114) is a specific legacy driver often sought to fix the common "Code 10" error on Windows 10 and 11. 💡 Why this specific version?

Many PL2303 USB-to-serial adapters on the market use "counterfeit" or older chips. Modern Prolific drivers (v3.4+) are designed to detect these chips and disable them, resulting in the "This device cannot start (Code 10)" error in Device Manager.

Version 3.3.3.114 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"

If your adapter isn't working, follow these steps to force the older driver:

Download: Locate the 3.3.3.114 .exe or .zip from a trusted driver archive.

Install: Run the installer. Even if it says "already installed," proceed.

Device Manager: Right-click the Start button > Device Manager.

Find Device: Look under Ports (COM & LPT) for the "Prolific USB-to-Serial Comm Port" with a yellow warning triangle. Update Driver: Right-click the device > Update driver. Select "Browse my computer for drivers."

Select "Let me pick from a list of available drivers on my computer."

Select 3.3.3.114: Choose the version dated 2009 (3.3.3.114) from the list and click Next. ⚠️ Important Notes prolific usbtoserial comm port version 333114 driver

Auto-Updates: Windows Update may try to "update" you back to a non-working version. You may need to use the "Show or Hide Updates" troubleshooter tool from Microsoft to block it.

Security: Only download drivers from reputable community forums or hardware manufacturers to avoid malware.

Hardware: If you frequently use serial adapters for work, consider upgrading to an FTDI-based adapter, which avoids these "Code 10" driver headaches entirely.

If you're having trouble finding the file or need help with a specific device error code, let me know: Are you on Windows 10 or 11?

What hardware are you trying to connect (e.g., radio, GPS, router)?

The Prolific USB-to-Serial COM Port driver version 3.3.3.114 is a legacy software component essential for connecting serial-based devices (like GPS, modems, and barcode scanners) to modern PCs. While newer versions exist, version 3.3.3.114 is often sought after as a "fix" for older hardware chips that are no longer supported by the latest Windows 10 and 11 updates. 🛠️ Essential Driver Facts

Chipset Compatibility: Primarily used for the PL2303 family, including the HXA, XA, and TA variants. Release Date: Originally dated around January 14, 2009.

Supported OS: Officially compatible with Windows XP, Vista, and 7, but used as a workaround for Windows 10 and 11.

The "Code 10" Fix: Modern Windows versions often disable older "End-of-Life" (EOL) Prolific chips. Installing this older version manually is a common method to bypass the "Device cannot start (Code 10)" error. 📥 Where to Find It The Prolific USB-to-Serial Comm Port Driver (Version 3

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

Manufacturer Archives: Sites like Plugable and Dell Support provide legacy Prolific driver packages that include or supersede 3.3.3.114 for older hardware.

Official Prolific Site: For the most recent stable release, you can use the Prolific Download Page (login with "GUEST" / "GUEST"). ⚙️ Installation Guide (Windows 10/11)

To make this driver work on modern systems, you must prevent Windows from automatically updating it to a newer, incompatible version:

Download & Run: Execute the installer (typically .exe) to add the driver files to your system.

Open Device Manager: Right-click the Start button and select Device Manager.

Locate Device: Find "Prolific USB-to-Serial Comm Port" under Ports (COM & LPT). Update Manually: Right-click the device > Update driver. Select Browse my computer for drivers.

Select Let me pick from a list of available drivers on my computer.

Select Version: Choose the 3.3.3.114 (or any 2008/2009 version) from the list and click Next. Installation Steps: 1

🚩 Note: If the device still shows a yellow exclamation mark, you may need to disable Memory Integrity in Windows Security or use a "Code 10 Fix" utility tool.

If you tell me the operating system you are using (e.g., Windows 11 Home) and the hardware device you're trying to connect, I can provide a direct download link and specific troubleshooting steps. Prolific Usb-to-serial Comm Port Version 3.3.3.114 Download

Installation Steps:

1. Download the Driver Safely Do not use random driver download sites. Obtain version 333114 from:

  • Prolific’s official legacy driver archive (check their website under "Support > PL-2303 > Legacy Drivers").
  • Trusted repository sites like GitHub (search for "PL2303 driver 3.3.31.14").
  • The official driver package file is typically named PL2303_Prolific_DriverInstaller_v3.3.31.14.zip or similar.

2. Extract the Files Extract the ZIP to a folder (e.g., C:\Drivers\Prolific_333114). Inside you should find:

  • PL2303_64bit_Installer.exe (for 64-bit Windows)
  • PL2303_32bit_Installer.exe (for 32-bit Windows)
  • .inf and .sys files for manual installation.

3. Run the Installer (Recommended Method)

  • Right-click the appropriate .exe file > Run as Administrator.
  • Follow the on-screen prompts. Do not plug in the USB adapter until the installer finishes.
  • After installation completes, restart your PC.

4. Manual Installation (If Installer Fails) For stubborn systems or driver signature issues:

  • Open Device Manager.
  • Right-click the problem device > Update driver > Browse my computer for drivers.
  • Click Let me pick from a list of available drivers on my computer.
  • Click Have Disk > Browse – navigate to the extracted 333114 folder and select the .inf file (e.g., ser2pl.inf).
  • Click OK > Next. Ignore any "Windows cannot verify publisher" warnings (choose "Install this driver software anyway").
  • Reboot.

5. Verify Installation Go to Device Manager > Ports (COM & LPT). You should see: "Prolific USB-to-Serial Comm Port (COMx)" without any exclamation mark. Right-click > Properties > Driver tab. Confirm Driver Version: 3.3.31.14.

Overview

This driver package installs the necessary software to enable communication between a PC and a device connected via a Prolific PL2303-based USB-to-Serial adapter. Version 3.3.3.114 is a legacy driver intended for older operating systems and older PL2303 chip revisions (specifically PL2303 HXA, XA, or older revisions).

Important Compatibility Note:

  • This driver (v3.3.3.114) is NOT compatible with Windows 8, 8.1, or 10/11 for newer PL2303 chips (PL2303TA, TB, GC, GS, GT, HXD, HXN).
  • It is intended for Windows XP, Vista, 7 (32-bit & 64-bit) and uses legacy chip support.
  • For newer chips on modern OS, use Prolific Driver v1.x or v2.x (from Prolific official site).

6. Verification Steps

To confirm which driver version is active and chip behavior:

  1. Connect the USB-to-Serial adapter.
  2. Open Device Manager > Ports (COM & LPT).
  3. Right-click “Prolific USB-to-Serial Comm Port” > Properties > Driver tab.
    • Check Driver Version = 3.3.114.0
  4. Details tab > Property = Hardware Ids
    • If you see USB\VID_067B&PID_23A3 → likely new chip (supported).
    • If you see USB\VID_067B&PID_2303 → likely legacy chip (incompatible with v3.3.3.114).
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