Prolific Usbtoserial Comm Port Version 333114 Driver -
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
Windows 10 and 11 feature aggressive automated hardware updates. Left unchecked, the operating system will likely overwrite version 3.3.3.114 with a non-working newer version within a few days. Method A: Use the "Roll Back Driver" Feature
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 .
(Windows 10/11):
The root cause of this problem is almost always a driver mismatch, specifically involving . This guide will explain why this error happens and how to permanently fix it. Why Version 3.3.3.114 Causes Error Code 10
If the download is a ZIP file, extract it to a dedicated folder on your Desktop.
Have you had success or trouble with Prolific v3.3.3.114? Share your experience with the community. prolific usbtoserial comm port version 333114 driver
| Feature | Prolific 333114 Driver | Prolific Latest Driver (v3.8+) | |--------|------------------------|--------------------------------| | | ✅ Full support | ❌ Deliberately blocked (Code 10) | | Counterfeit Chip Handling | Lenient (works with many clones) | Very strict – disables clones | | Windows 7 Support | ✅ Native | Partial (requires SHA-2 updates) | | Windows 10/11 (latest builds) | Works with signature override | ✅ Fully signed | | Stability with older hardware (PLC, CNC) | Excellent | Unpredictable (timeout errors) | | Driver signing | SHA-1 (older) | SHA-256 (modern) |
, use pnputil or Group Policy to block driver updates for VID_067B&PID_2303.
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. If you have already installed newer drivers, simply
You will see a list of installed drivers. Select the older version (e.g., or Version 3.3.2.102 ).
Windows Update frequently overwrites legacy drivers during weekly system maintenance scans. If your adapter suddenly stops working, repeat from the installation guide above to roll it back. You can also use third-party tools or Windows Group Policy to permanently disable driver updates for that specific hardware ID. COM Port Numbers Change Automatically
Click . Select the 3.3.3.114 version from the list and hit Next . Troubleshooting Common Issues The Driver Reverts to a Newer Version Method A: Use the "Roll Back Driver" Feature
