The primary reason users search for this specific version is the Prolific "genuine check" policy. Starting around 2012, Prolific released drivers designed to detect whether the PL2303 chip in your USB-to-Serial adapter was an official Prolific product or a third-party clone.
Right-click the device > Properties > Details tab > Property dropdown: . You will see something like:
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 . prolific usbtoserial comm port version 333114 driver
Modern PCs lack the physical 9-pin RS-232 serial ports common on legacy hardware. To connect older serial-based hardware, IT professionals use USB-to-Serial adapters built on the chipset series.
Even after installing the old driver, Windows will often default to the newer version 3.3.3.114. You must manually select the older version. Plug your USB-to-Serial adapter back into a USB port. Open and expand Ports (COM & LPT) . The primary reason users search for this specific
: It works across Windows 7, 8, 10, and even Windows 11, provided the automatic update feature is managed. Key Technical Specifications Driver Version: 3.3.3.114 Release Date: Circa 2009–2010 Supported Chips: PL-2303 H, HX, HXD, EA, RA, SA, TA, TB.
Before downloading, confirm that your hardware and software require this specific version. You will see something like: Go to Device
, use pnputil or Group Policy to block driver updates for VID_067B&PID_2303.
The Prolific PL2303 chip family has been manufactured for over two decades. Over that time, the market became flooded with counterfeit or cloned PL2303 chips.
Select .
Version 3.3.3.114 is widely recognized in the tech community as a solution for the persistent "Code 10: This device cannot start" Prolific Usb-to-serial Comm Port Version 3.3.3.114 Download
