![]() So no matter how many times you remove the driver files and reboot - the next time you insert the USB-To-Serial adapter, Windows installs the newest non-working version again. (What worsens this issue is that there are many "Prolific Driver Removal Tools" that do not work properly.)Īnd Windows 8, 8.1 and Window 10 are set by default to automatically update your drivers without your permission or even notifying you of the update. However if you didn't have a previous driver installed that worked - you'll have to go through the process of removing any PL-2303 driver installation programs, the actual driver files, and the information (.INF) file, BEFORE you are able to successfully install the correct driver. If your adapter was working prior to going to Windows Update, you can "roll back" to the previous installed driver and all will be well once again. Or you may get no error at all, but your device will still not work. The Prolific 64-bit drivers that Microsoft supplies via Windows Update, Versions 3.4.67.325, 3.4.25.218, 2.1.51.238 and 3.4.62.293 - will not work with most adapters and therefore shows the generic "Code 10" error. Unfortunately this decision also renders all earlier adapters inoperative. To solve this intellectual infringement - original Prolific company modified their newest drivers to render the counterfeit adapters unusable. The counterfeit chip use the same Vendor ID (VID_067B) and Product ID (PID_2303) - as the authentic Prolific chips. Main cause of this issue is because the device you own contains a counterfeit "Prolific" chip (China clone). Even vendors selling their "USB to Serial" adapters are baffled. "Device driver was not successfully installed"Īvailable forum solutions to this problem are half-baked.Issue will also may show messages like this: This confirms you need to install correct driver file.) That means correct driver version is not installed.)Īnd if you double-click on it, you will see: ![]() (Notice in above picture, yellow triangle next to "Prolific USB-to-Serial Comm Port (COM X)". Works on 32/64-bit.Īnd it addresses issue of: Prolific PL-2303 Driver Fix (VID_067B&PID_2303)ĭriver issue will show inside your Device Manager like this: ![]() In summary, this article is for: Windows XP, Windows 7, Windows 8, Windows 8.1 and Windows 10. ![]() Purpose of this article is to guide you on how to FIX the "Prolific USB-to-Serial" driver issue with common cheap units. Also, without knowing too much about the difference between win 10/11, it seems like the drivers should work fine from 10 to 11? Like, there's no reason why a driver from 2005 should work, and a driver from 2020 does not.Article credit goes to:. It's really frustrating that Prolific has a pretty terrible website, and that they purged a bunch of links that have worked in the past. Īfter downloading the zip, I installed the driver, and rolled back the software as described somewhere in this thread. I went on the Adafruit website prepared to buy a new cable that's compatible with Windows 11, and found out they have a link to the older driver! Link to the Adafruit page. PLEASE CONTACT YOUR SUPPLIER." When I delete and let WIndows Update try it, I get an error about the driver not being supported on Windows 11. If memory serves, the error code I got was something along the lines of "THIS IS NOT A PROLIFIC DEVICE. ![]()
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