I have tried with 3. Available forum solutions to this problem are half-baked. StanP12 Replied on December 16, Mohammed Yaseer Replied on August 16, If you watch the configuration panel, you will see the COM port coming OK, but then switch off because of error

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In the Properties Window, Click on “Driver”. Prolific also prohibits the distribution of any PL drivers including download links without written permission from Prolific.

Prolific Drivers – Plugable

Download drivers from Prolific site. 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. polific

That means correct driver version is not installed. In the meantime action according this guideline was successful: If you don’t have prollfic old versions of drivers, you can tried to install them from the minidisc provided with your product.

I prefer not to block all updates. Run the installer program. FelixHitz Replied on December 1, I have the same question Hope this information helps and let us know the status of the issue we will be glad to help you.

The only problem with it, is that, it reload the latest driver when you plug the device on a never used USB port.

As many people, you probably upgrade directly from W7 to W10, and pp203, don’t know that this problem was already present with W8. In reply to FelixHitz’s post on December 1, Each time you turn your computer off, the latest driver is reloaded due to windows auto-update or if you unplug and plug again the device into USB port.

If not, then the correct driver is not installed.


Prolific will take proper and severe actions to cease and confiscate these counterfeit products. Prolific’s guys are fun when they said: This thread is locked. Click on Hardware and Sound, click on Hardware and Devices. This confirms you need to install correct driver file.

Unfortunately this decision also renders all earlier adapters inoperative. If you want to delete it – use the Windows “Uninstall a Program” or “Add or Remove Program” feature – however this will also uninstall the driver itself. Home Contact Support Knowledgebase Downloads. On the next windows, choose the second lp203 “Look for a driver on my computer”. I have tried with 3. Of course, you can try to manually update the driver at Prolific site: Removal of this tool: Available forum solutions to this problem are half-baked.

In summary, this article is for: Taipei Headquarter 7F, No. Prolific advices end-users to only purchase vendor branded cable products with company name contact information for service and support. How satisfied are you with this response? If it offers a choice to remove the driver, then select to remove the current “bad” driver.

Close the Sirf Demo software.