The term "portable" in the context of firmware upgrades usually refers to performing the upgrade without needing to directly access the device through its web interface or a computer connected to it. For consumer electronics like routers, the process typically requires a computer or mobile device for accessing the interface. However, for field or direct technician upgrades, there might be specific tools or methods used.
Most units are configured to receive updates over the air via the ISP’s management protocol (OMCI or TR-069) ztegpon.cz Manual Upgrades: Requires a specific firmware file (usually a zte f670l upgrade firmware portable