![]() ![]() 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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