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🟡 Needs clarification – The current phrasing is too vague for technical or user-facing documentation. Once “top” is defined, it becomes useful.
Example output:
V9.0.10P2N24 (this is an older build)
V9.0.10P5N90 (this is likely the “V90” build)
If you see P5N90, V90, or 9.0.10P5N90 anywhere, you either have the fixed firmware or are close to it. If you have any P2, P3, or P4 build, you are on buggy firmware. zte f670l v90 firmware fixed top
The CPU 100% spikes cause the SIP daemon to lag. You hear "robot voice" or one-way audio. The fixed firmware isolates the VOIP process on a dedicated core or assigns a real-time priority that the scheduler cannot interrupt.
A: Indirectly, yes. The “fixed top” patch stops the 5 GHz radio from dropping, which improves perceived range. However, transmit power remains the same as hardware allows (around 20 dBm). 🟡 Needs clarification – The current phrasing is
The "Fixed Top" firmware is not an official ZTE global release title, but rather a community/ISP-certified build number that patches the memory leak and scheduler bug. Based on reverse engineering and ISP changelogs, the stable builds that address the "Top" issue are:
These builds contain a patched version of the omci (ONU Management and Control Interface) stack and a revised process priority table. The "Fixed Top" firmware ensures that the system load average never exceeds 1.5 under a full Gigabit NAT session. The CPU 100% spikes cause the SIP daemon to lag
If your ZTE F670L V90 is running a buggy firmware (e.g., v9.0.10P1N14 or older), you will experience:
If you want to use your own router, go to Network → Internet → Edit WAN interface → Change from “Route” to Bridge. Then connect your router to LAN port 1. The V90 firmware finally makes bridge mode stable.
After flashing and testing the V90 update (or watching it roll out automatically), here are the three tangible differences users are reporting:
