If the driver does not install via a standard .exe , it must be installed manually via the Device Manager. Step A: Preparation

After the restart and with driver signature enforcement disabled, plug your device back in. Windows will likely fail to install it automatically.

Prolific USB-to-Serial Comm Port Version 3.2.0.0 Download and Installation Guide (2021 Update)

Newer drivers (often versions 3.8.x and above) are designed for the latest chip revisions and will often block older hardware. Version 3.2.0.0 is widely recognized as the "magic" legacy driver that restores functionality for older PL2303 HXA/XA and TA/TB chips on Windows 10 and 11. Step-by-Step Installation Guide

If you see "Prolific USB-to-Serial Comm Port" with a yellow triangle (Code 10), right-click it and choose . Select "Browse my computer for drivers" .

To fully understand why version 3.2.0.0 is so widely sought after, it helps to know the history behind Prolific's driver lockout. PL2303 chips were so successful that they became a target for counterfeiting, primarily by Chinese manufacturers. These counterfeit chips were functionally similar enough to work with genuine drivers, but they infringed on Prolific's intellectual property. In response, Prolific began updating its drivers to detect counterfeit chips and block them from functioning. The detection logic was implemented in driver versions 3.9.x and later. When a counterfeit chip was detected, the driver would deliberately prevent the device from starting, displaying the infamous "Code 10" error message.

file and follow the prompts. Note that this might not immediately fix the issue if a newer driver is already active. Manual Rollback in Device Manager Device Manager (Right-click Start > Device Manager). Ports (COM & LPT) and right-click your "Prolific USB-to-Serial Comm Port". Update driver Browse my computer for drivers Let me pick from a list of available drivers on my computer Choose the version that specifically says and click Next. Verify the Fix

Summary

: This is the most frequent error with Prolific devices on Windows 10 and 11. It almost always indicates that Windows has loaded a driver that either does not support your chip version or has detected your chip as counterfeit. The solution is to uninstall the current driver completely, disconnect the cable, restart the computer, reconnect the cable, and then manually install version 3.2.0.0 following the steps above. The Code 10 error is widely reported among users of older USB-to-serial adapters, and version 3.2.0.0 is the proven fix.

: Legacy support for specific hardware brands, such as Dell , may offer specialized installers, though they often host newer versions like 5.1.x or 5.2.x.

That’s why people search for — it’s one of the last versions that still works with many clone chips , especially on Windows 7, 8, and early Windows 10.

. Search for "Prolific Serial" and look for older published dates (e.g., around 2008-2010). 2. Installation Steps

To use version 3.2.0.0 on modern systems, you must manually "backdate" the driver because Windows Update will automatically overwrite it with a newer, non-functional version. Obtain the Driver : Download the version 3.2.0.0 installer (often found as