Change the USB cable, try a USB 2.0 port instead of USB 3.0, or re-install the ZTE LTE drivers.
Insert a SIM card from any network provider into the router slot. unlock zte mf927u software install download
Qualcomm Product Support Tools (QPST) and generic firmware flashers are used to rewrite the low-level software on the device. General Firmware Flashing Workflow Change the USB cable, try a USB 2