You will want the latest Quectel PC drivers as well: https://drive.google.com/file/d/1ciwhNN ... sp=sharing
Linux: https://drive.google.com/file/d/1oo5r9s ... sp=sharing
Mac: :shrug:

Install the drivers, then reboot.
Plug your modem into your computer via USB adapter, and give it time to load up the drivers for it and recognize/assign all ports.
Run the Qflash app and select the proper port for the modems DM port. (Device Manager for Windows, or get the Huawei modem terminal)
Choose the firmware file that you need.
Flash away.