Right-click any existing Prolific USB-to-Serial Comm Port and select .
If you are using a genuine Prolific adapter, always prefer the latest drivers from Prolific.com.tw for better security and stability.
The significance of this specific driver version lies in a long-standing conflict between Prolific and the market for inexpensive clones. Prolific phased out several chip versions in 2012 due to widespread counterfeiting. To combat this, newer drivers (such as version 3.8.x and above) include a check that disables any chip it identifies as non-genuine or end-of-life. Note: How to not get scammed with Prolific (PL2303) USB
Supports Prolific PL2303 H, HXA, X, EB, and G series chips. Why This Version is Used prolific usbtoserial comm port version 333114 driver
Look for PL2303_Prolific_DriverInstaller_v333114.zip or .exe . Step-by-Step Installation Guide (Windows 10/11)
, use pnputil or Group Policy to block driver updates for VID_067B&PID_2303.
Windows will revert to your manually selected older driver and will usually remember your preference for a while. Method 2: Use the "Show or Hide Updates" Troubleshooter Prolific phased out several chip versions in 2012
The remains one of the most essential troubleshooting tools for anyone dealing with older serial devices, PLC systems, or diagnostic equipment on modern Windows 10/11 machines. By bypassing the "not genuine" check of newer drivers, it provides a stable connection for the still-prevalent PL-2303HX and HXA chips.
as Administrator.
(Windows 10/11):
If you have already installed newer drivers, simply running the 3.3.3.114 installer might not work because Windows will continue to use the newer, broken driver. Method 1: The "Update Driver" Method
While the Prolific USB-to-Serial Comm Port and the version 3.3311.4 driver are reliable, issues can still arise. Here are some common troubleshooting techniques:
Because Windows Update automatically overrides older software, you must explicitly instruct your operating system to use version 3.3.3.114. Follow this exact sequence: Step 1: Download and Extract and G series chips.
Right-click the Start button and select Device Manager .