Before downloading any update, verify what you have installed.
The easiest way to update is through the modem's built-in web interface: your MF79U to a computer’s USB port. zte mf79u firmware
If you are uncomfortable with manual flashing, consider using tools like (paid) or hiring a remote technician. But for the adventurous, the steps above will turn your MF79U into a fully unlocked, high-performance 4G modem. Before downloading any update, verify what you have