: Go to Settings > Device Settings > Update Management . Check for Updates :

The ZTE MF79U is a highly popular, budget-friendly 4G LTE USB modem and Wi-Fi hotspot. Out of the box, it provides a stable connection for basic browsing. However, many users quickly run into artificial limitations imposed by network carriers or generic factory software.

Once you have the better firmware installed, maintain its performance:

: True "plug-and-play" capability; drivers install automatically on Windows and Linux. Reliability