Here's a step-by-step guide to help you flash the ZTE F670L V90 firmware:
: Includes a dual image system that prevents device "bricking" by ensuring the ONT remains functional even if a software download or upgrade is interrupted. zte f670l v90 firmware link
: Discussions often contain shared links and guides for upgrading or downgrading firmware specifically for enabling bridge mode. Official Support : Here's a step-by-step guide to help you flash