your adapter. If Windows automatically tries to "update" it to a broken version, proceed to the manual selection step below. 3. Manually Selecting the Legacy Driver
: You can access their current driver downloads at Prolific USA or via their Customer Login (using GUEST for both username and password) to see if they still offer legacy versions. prolific usb to serial comm port version 32 00 download 2021
You browse to the folder, but no driver appears. The Fix: Ensure you have extracted all files, specifically the ser2pl.inf or pl2303.inf file. Some adapters require you to run an executable installer (e.g., PL2303_Driver_Installer.exe ) first to unpack the INF files, then perform the manual "Have Disk" method. your adapter
| Chip Revision | Supported by v3.2.0.0? | Common Devices | |---------------|------------------------|----------------| | PL2303 HXD (Rev D) | ✅ Yes | High-quality adapters | | PL2303 HXA (Rev A) | ❌ No (Code 10 / Error 43) | Older cables (pre-2012) | | PL2303 TA (Rev E) | ❌ No | Many generic adapters | | Counterfeit chips | ❌ No | Cheap eBay/Amazon cables | Manually Selecting the Legacy Driver : You can
If you are seeing a yellow warning triangle and a error in your Device Manager, you likely have a PL2303-based adapter with a "phased out" or non-genuine chip. Modern Windows updates often automatically install the latest Prolific driver, which purposely disables older or counterfeit hardware.
Open the Device Manager. Under the "Ports (COM & LPT)" section, right-click on the "Prolific USB-to-Serial Comm Port" (which will have a yellow exclamation mark) and select . In the confirmation dialog, make sure to check the box labeled "Delete the driver software for this device" before clicking Uninstall. After uninstalling, unplug your USB-to-Serial adapter and restart your computer.