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Ensure the baud rate (speed) in Device Manager matches the exact baud rate required by your connecting software (e.g., 9600, 115200).

Download the ZIP archive containing the Prolific v3.2.0.0 installer or executable. Extract the contents to a dedicated folder on your desktop. Step 2: Disconnect Internet and Run Setup

Even after installing, Windows may keep using the newer, non-working driver. You must force it to use the 3.2.0.0 version: prolific usb to serial comm port version 32 00 download 2021

Follow the on-screen prompts to complete the installation wizard. Restart your computer. Step 4: Force Windows to Use the Old Driver Plug your USB-to-Serial adapter back into a USB port.

Some legacy software only reads COM1 through COM4. In Device Manager, right-click the Prolific device, go to Properties > Port Settings > Advanced , and change the COM Port Number to an open low number. Ensure the baud rate (speed) in Device Manager

Check the box next to the Prolific driver update to prevent Windows from seeing it. Method B: System Properties Hardware Settings

This is a critical prerequisite. Windows will constantly try to "update" your manually installed v3.2.0.0 driver to a newer, non-functional version. The definitive way to prevent this is to disable automatic driver downloads via Windows Update. You can find this option in the "Advanced system settings" under the "Hardware" tab, or through Group Policy in Windows Pro editions. As an alternative, you can pause Windows Update for a few weeks after a successful driver rollback. Step 2: Disconnect Internet and Run Setup Even

For official, modern hardware, you can download the latest drivers (v4.0+) directly from the Prolific Support Website using the guest credentials for both username and password. Microsoft Community Hub you're seeing in the Device Manager? Prolific USB-to-Serial Comm Port (COM8) Driver for Zepto

Select from the list.