If you have lost your password or the device is behaving erratically (blinking PON light despite good fiber), perform a factory reset.

Warning: A reset may deregister the device from your ISP. You may need to call your ISP to re-register the device's serial number (found on the bottom label: MAC or SN).

How to reset:

The official manual usually highlights three crucial sections. Here is the plain-English version:

Before diving into the manual settings, it is crucial to understand what the ZTE F6107A actually does. Unlike a standard router that uses a coaxial cable or DSL line, the F6107A uses GPON (Gigabit Passive Optical Network) technology.