You need to rebuild the firmware with your feature.
define Package/traffic-led SECTION:=utils CATEGORY:=Utilities TITLE:=Flash LED on high network traffic DEPENDS:=+libubox +libubus endef
Add web UI or config option to map VLANs dynamically.
: Modern firmware versions include support for OMCI (ONT Management and Control Interface), which allows ISPs to manage the device remotely.
Use , kernel modules (if kernel version matches), or LD_PRELOAD hooks.
Many early GM220-S firmware builds had broken IPv6 DHCP-PD (Prefix Delegation). An update resolves "No IPv6 connectivity" errors.
Once you have the correct .bin or .img file, follow this procedure precisely.
However, there are "modded" firmwares circulating (usually from Russian or Brazilian forums) that: