A: Microsoft’s KB5004237 (July 2021) tightened driver signing. Download the specifically updated 2021 driver from FTDI/Prolific/WCH.
The driver acts as a translator between the device’s hardware signals and your computer’s operating system. Without the correct 2021 driver version, your computer may:
Search for that specific VID and PID code online to find the exact manufacturer (often Realtek, MediaTek, or Ralink).
