This guide shows a safe, step-by-step process to obtain and flash the V90 firmware for the ZTE F670L (GPON/EPON ONT) to fix UI/top-bar problems that appear after upgrades or config changes. It assumes the problem is a firmware/UI bug and that you have local access to the device (Ethernet) and a PC.
The specifically targets the kernel-level processes responsible for system uptime. By patching the memory leaks and race conditions that caused previous crashes, the firmware ensures that the "Time of Power" remains consistent until a user or ISP manually initiates a reboot. zte f670l v90 firmware fixed top