The frustrating is not caused by broken hardware. It occurs because Microsoft Windows automatically installs the newest Prolific driver available via Windows Update.
Users with older adapters must often manually "downgrade" to a 2008 or 2015 driver version to regain functionality. Official Support Limits: prolific+usb+to+serial+comm+port+version+32+00+download+2021
Prolific technology remains one of the world's most cloned microchip architectures. To combat clones, Prolific released driver updates that check for authentic hardware signatures. If your hardware uses an End-of-Life (EOL) chip version (such as the PL-2303HXA, TA, or a generic copy), newer drivers will render the device completely unusable. Driver Version Release Era Behavior with Older/Clone Chips Works flawlessly ; does not block hardware. v3.8.x and higher Modern / Windows Update Throws Code 10 / Error Message . The frustrating is not caused by broken hardware
| Error | Likely Cause | Fix | | :--- | :--- | :--- | | | Very old PL-2303H (non-X) chip | Uninstall v32.00, use v2.1.0.0 instead | | Code 28 (Drivers not installed) | Windows Defender blocked the install | Temporarily disable Core Isolation / Memory Integrity | | Code 31 (Device not working) | Conflict with another serial driver | Uninstall all other USB-serial drivers (FTDI, CH340) | | COM port disappears after sleep | Power management issue | In Device Manager > Properties > Power Management > Uncheck "Allow the computer to turn off this device" | Official Support Limits: Prolific technology remains one of
Fixing the Prolific USB-to-Serial Comm Port Driver Error: 2021 Version 3.2.0.0 Download Guide
Common user reports (real-world experiences)
Example: command-line verify (PowerShell)