Firmware acts as the "brain" of your router. Regular updates typically address: Security Patches
This is the most confusing area for users. The ZTE MF920U comes in three firmware variants: Zte Mf920u Firmware
The ZTE MF920u is a portable 4G LTE USB modem (also called a USB dongle or mobile broadband stick) that allows a computer to connect to cellular networks. It’s used with SIM cards from mobile carriers and typically includes a small embedded web interface for status, SMS, and basic settings. Firmware acts as the "brain" of your router