The GM220-S firmware supports multiple fiber technologies, including
: English firmware is widely available for international markets, though some units come with Chinese interfaces. Firmware Gm220-s
Most GM220-S units are . This means the service provider (such as Movistar, Claro, or others) pushes updates automatically over the fiber line (OAM/OMCI). Firmware Gm220-s
Official firmware is rarely available directly from manufacturer websites for consumer download. Users typically obtain it through: Firmware Gm220-s