The ZTE MF90 is a popular mobile broadband modem, and I'll provide you with some information on how to obtain the firmware.
You're looking for the ZTE MF90 firmware without branding, also known as a "complete piece" or "unbranded" firmware. zte mf90 firmware no brand
Unbranded firmware, also known as stock firmware or generic firmware, is the original firmware that comes with the device, without any customizations or branding from a specific carrier or manufacturer. This type of firmware is usually used for devices that are not locked to a specific carrier or region. The ZTE MF90 is a popular mobile broadband