The official source for licensed users. Look for "ONT Multicast Upgrade Tool" or "V100R001C00SPC205" (or newer versions).
: If you cannot find official firmware, it is recommended to contact your Internet Service Provider (ISP) , as many Huawei ONT/routers use customized software. download multicast upgrade tool for huawei lan port routers
To upgrade several routers of the same model simultaneously: The official source for licensed users