Solved: Prolific USB to Serial Driver Windows 10 Not Working

By April Cai  Driver Error  driverUSB   0 Comment

Fail to connect your devices with Windows 10 using the Prolific USB to Serial adapter cable? Besides, you might notice there’s a yellow warning mark with Prolific USB to Serial driver in Device Manager. That could be really frustrating…

Don’t panic. Certainly you’re not the only one. We’ve seen many Windows users reporting this Prolific USB to Serial driver not working on Windows 10 issue. More importantly, you can easily fix it with the solutions here. Read on and see how…

Try these fixes:

  1. Update your Prolific USB to Serial driver to the latest version
  2. Roll your Prolific USB to Serial driver back to an older version

Solution 1: Update your Prolific USB to Serial driver to the latest version

Your not working Prolific USB to Serial driver problem could be caused by the corrupted, missing or outdated driver itself. So it would help if you update the driver to the latest version.

You can update your Prolific USB to Serial driver to the latest version either manually or automatically.

  1. Manual driver update – You can update your Prolific USB to Serial driver manually by going to the official Prolific website, and searching for the most recent correct driver. Be sure to choose the only driver that is compatible with your Windows version.
  2. Automatic driver update – If you don’t have the time, patience or computer skills to update your Prolific USB to Serial driver manually, you can, instead, do it automatically with Driver Easy. Driver Easy will automatically recognize your system and find the correct driver for your exact Prolific adapter, and your Windows version, and it will download and install them correctly:
  1. Download and install Driver Easy.

  2. Run Driver Easy and click the Scan Now button. Driver Easy will then scan your computer and detect any problem drivers.

  3. Click Update next to the flagged Prolific USB to Serial driver to automatically download the correct version of that driver, then you can manually install it (you can do this with the FREE version).

    Or click Update All to automatically download and install the correct version of all the drivers that are missing or out of date on your system. (This requires the Pro version which comes with full support and a 30-day money back guarantee. You’ll be prompted to upgrade when you click Update All.)

Solution 2: Roll your Prolific USB to Serial driver back to an older version

You may note that up-to-date drivers always keep your devices works in the best condition. But sometimes the latest driver doesn’t work with old hardware.

When you upgrade your older Windows system to the latest Windows 10, or perform updates directly on Windows 10, the Prolific USB to Serial driver also gets update, and if it doesn’t work with your old hardware, you might have the problem. So you can try to downgrade your Prolific USB to Serial driver.

Here’s how you can do it:

  1. On your desktop, right-click on the Start button, then select Device Manager.

  2. Double-click Ports(COM & LPT), then right-click on your Prolific USB to Serial driver to select Update driver.

  3. Click Browse my computer for driver software.

  4. Select Let me pick from a list of available drivers on my computer.

  5. Select an older version on the Model list. Then Next.

Then the driver you select would be installed on your Windows 10 computer automatically.

Once it’s done, connect your device again and see if it goes well.


Hopefully this helps. Feel free to comment below with your own experiences.

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