Firmware - Gm219-s Xpon [patched]

This is the standout feature. The firmware allows the device to function on both GPON (Gigabit Passive Optical Network) and EPON (Ethernet Passive Optical Network) architectures. It can "auto-sense" the OLT (the provider's equipment) and switch modes accordingly.

Decompile the web_cgi binaries. There is a hidden thread running on UDP port 55555 (not the usual TR-069 port 7547). It phones home to pdt.chinamobile.com or rms.chinamobile.com every 60 seconds. Even if you disable TR-069, this persists. The payload includes your PON signal strength, CPU load, and—more worryingly—the MAC addresses of the last 5 devices connected via LAN. firmware gm219-s xpon

Includes built-in firewall functions and port isolation. This is the standout feature