: If a firmware update fails and the device becomes unresponsive (lights flashing or stuck), users sometimes use a "trap" interface method. This involves specific AT commands like at^modimei= or shorting internal contacts to force the device into a state where it can be re-flashed.
If your device behaves unexpectedly after an update, check the indicator lights: : Registered to 2G/3G network. Blue Solid : Registered to 4G LTE network. Red Blinking : Battery is low; charge immediately. MF920U Quick Start Guide - FCC Report zte mf920u firmware update
: In the web interface ( Settings > System Update ), look for a "Local Update" or "Offline Update" option. : If a firmware update fails and the