A: Not truly universal. Search for F670L_EPON_V6.0.10P12T25_Unlock.bin – works on most V1.0 hardware.
An exclusive firmware build (or a modified stock image) allows you to access http://192.168.1.1/cu.html (or similar hidden portals) to change: zte zxhn f670l epon firmware exclusive
Includes a dual-image system to prevent service interruption during firmware upgrades. L-Square Century Co., Limited Firmware & "Exclusive" EPON Access AC1200 Dual-Band Wi-Fi 5 GPON ONT — ZXHN F670L | ZTE A: Not truly universal
To obtain the latest firmware updates for your ZTE ZXHN F670L EPON ONT device: zte zxhn f670l epon firmware exclusive