Without the driver, the computer sees the device merely as a "USB Device." With the driver, the computer understands it as a serial communication interface.
When we combine these, refers to the specific configuration where the software driver has successfully created a virtual communication channel that is set to the correct parameters to allow diagnostic data to flow unimpeded.
QPST (Qualcomm Product Support Tool) and QXDM (Qualcomm eXtensible Diagnostic Monitor) .
Open your device manager (Windows) or ls /dev/tty* (Linux/Mac). Ensure your interface driver is installed (e.g., FTDI VCP driver). Your interface will appear as COM3 , COM5 , or /dev/ttyUSB0 .
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