After you complete your download, move on to Step 2. To get the Prolific USB-to-Serial Comm Port driver, click the green download button above. How to Update Prolific USB-to-Serial Comm Port Device Drivers Quickly & Easily Step 1 - Download Your Driver NOTE: Also read Windows Update overwrites my USB2SER driver.4085-Drivers/Drivers/WINXP/DRemover98_2K.exeĤ085-Drivers/Drivers/Win2K/DrvRemover.exeĤ085-Drivers/Drivers/Win98-Rev.0405/SERPORT.INFĤ085-Drivers/Drivers/Win98-Rev.0405/SERPORT.VXDĤ085-Drivers/Drivers/Win98-Rev.0405/USB2SER.INFĤ085-Drivers/Drivers/Win98-Rev.0405/USB2SER.SYSĤ085-Drivers/Drivers/Win98_Me/UserGuide.docĤ085-Drivers/Drivers/iMac/user'sguide.doc Windows will return to the Driver Properties view when the installation is completed. Select "Prolific USB-to-Serial Comm Port Version 3.3.11.152 ()", then click "Next". Click "Update Driver", then "Browse my computer for driver software".Ĭlick on "Let me pick from a list of device drivers on my computer". This dialog should open:ĭouble Click on "Prolific USB-to-Serial Comm Port (COMx)" to display the Properties. In the search results list, click "Device Manager". The easiest method to open Device Manager is to go to Windows Start, and in the search box, type "Device Manager". Perform the remaining steps with the USB to Serial device plugged in to your selected USB port.
Unzip and run the installer, "PL2303_Prolific_DriverInstaller_v1210.exe". If any other version of the driver is installed, follow these instructions to install the correct version. Prolific USB to Serial Comm Port Version 3.3.11.152Ĭheck the driver version using Windows Device Manager. This issue is caused by the installation of an incorrect driver by Windows when it "searches the internet for a driver." The correct driver version for the USB to Serial Adapter is:
If you still have a problem, you may try this procedure to revert to a previously known working driver. NOTE: This issue has been resolved by Prolific. Also, the PL2303 Driver Manual will provide more information about compatibility of chip versions with Windows OS Versions, including a comprehensive comparison chart. You can DOWNLOAD THIS UTILITY from Prolific to identify your chip. IMPORTANT: Driver version 3.8.12 does not support older Prolific chip versions on Windows 10 (and 8/8.1).
Windows Update should install this version going forward. As of March 2017, after ongoing communication with the engineers at Prolific, the issue may be remedied with Driver VER-3.8.12.0 and higher. UPDATE: This issue is caused by the USB to Serial Comm Port Driver.
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