The is not a luxury; for users of this specific hardware revision, it is a prerequisite for stable internet. ZTE’s initial quality control on the V90 board was disastrous, but the community-driven identification of the "Top" bug led to patches that turned this ONT from a doorstop into a reliable workhorse.
Earlier firmwares had a known issue where the bridge interface would hang if the Wide Area Network (WAN) connection fluctuated. The V9.0 update fixes this by: zte f670l v90 firmware fixed top
Flashing incorrect firmware can brick your ONT. Ensure you have the exact file for your hardware revision (e.g., F670L V1 vs V2). Also, some ISPs lock firmware upgrades. If your “Upgrade” button is greyed out, you may need to request the update from your ISP or use a technician-level firmware tool. The is not a luxury; for users of
“ZTE F670L firmware V90 fixes an issue where the top navigation bar failed to load after a PPPoE reconnection.” The V9
: Before attempting any flash, always backup your current config.bin file. Tools like the ZTE Config Utility on GitHub can help decrypt or modify these files if needed.
Use only if TFTP/web upgrade fails and you have a serial adapter: