refers to a series of USB-to-Serial bridge chips frequently found on budget-friendly microcontroller boards. Functionally, it serves the same purpose as a CH340 or a CP210x chip: it allows your computer to communicate with a microcontroller (like an Arduino or ESP8266) via a standard USB port.
If you see "JXMCU" or "USB Serial" with a yellow exclamation mark, the driver is missing. Step 2: Download and Install the CH340 Driver jxmcu driver
Select (or Manufacturer) and choose the CH340/CH341 driver manually. Troubleshooting Common Issues refers to a series of USB-to-Serial bridge chips