When you plug the phone in, the tool should change from "Waiting for Device" to "Connected" . It will automatically detect the COM port (e.g., COM3).

Assuming you have obtained a clean copy of msmdownloadtoolv2071rcsm, follow this guide precisely.

Right-click MSMDownloadTool.exe and select Run as administrator. If you see a "Driver Not Found" error, do not panic—close the tool, reinstall drivers, and restart.