Double-check your firmware version and your compatibility with the tools. Try a different tool like zteOnu by stich86. If all else fails, searching community forums like Broadband Forum or PHCorner using your specific firmware version ( V9.0.10P18N2B , etc.) might turn up a specific solution.
: Some users find success by using "Inspect Element" in the browser to reveal hidden settings or by using specific Telnet enable tools often found on community forums like the India Broadband Forum. how to unlock zte f670l verified