no, it's my stock image with the OCMI modded... I don't really want to flash random images because they might hardware damage the thing by pulling the wrong I/O pin
the openwrt just doesn't forward IGMP traffic, normally they have igmpproxy package for that but it require a clear LAN/WAN interface meanwhile the GPON stick doesn't really expose the L2 WAN interface to the openwrt OS so I have no idea how to make it work