It is crucial to understand that ZTE does not release a universal "v9.0" file for public download. ISPs (like PLDT, Ooredoo, Zain, etc.) customize the firmware to lock the device to their network. Therefore, "v9.0" for one provider is different from "v9.0" for another.

Are you trying to or perform a manual update to fix a specific performance issue?

Enables flexible packet classification and up to eight priority queues for IPTV and VoIP.