For many ZTE modems and routers, advanced users use a combination of (a GUI for firmware editing) and OpenSSL to decrypt and re-sign firmware images. This allows users to modify the firmware before flashing it via TFTP or a standard upgrade page.
(Safest for Broadcom/CFE Routers)
The specific tool required depends on your device's hardware platform (e.g., Qualcomm vs. MediaTek). zte router flash tool
flash -noheader 192.168.1.10:firmware.bin flash0.trx For many ZTE modems and routers, advanced users
Practical recommendations for three user types For many ZTE modems and routers