Most connectivity issues with Prolific adapters are not caused by broken hardware. They are caused by digital rights management and chip generation conflicts.
There is a massive market of counterfeit Prolific chips (PL2303) used in generic USB-to-Serial cables. To combat this, Prolific updated their drivers (versions 3.4 and higher) to detect fake chips. If a fake chip is detected, the driver disables the port, causing it to stop working. prolific usb to serial comm port version 32 00 download 2021
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. Most connectivity issues with Prolific adapters are not
If your serial connection still fails after following the steps above, check the following hardware and software elements: To combat this, Prolific updated their drivers (versions 3
Download the official Microsoft "Show or hide updates" troubleshooting tool. Run the utility tool and scan for pending updates. Select the Prolific driver update from the list.
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