: Get the driver from the official manufacturer, WCH . Run : Open the CH341SER.EXE file and click Install .

: Run the installer. Ensure the "Install USB driver" box is checked during the setup process.

: Most modern macOS and Linux versions have these drivers pre-installed, but you may need to grant "dialout" permissions on Linux using sudo usermod -a -G dialout $USER .

If your computer doesn't recognize your board (it shows up as "Unknown Device"), you likely need the CH340 driver.