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# From ONU CLI (Telnet/SSH) tftp -g -r D401_GPON_V3.0.bin -l /tmp/fw.bin 192.168.1.100 upgrade /tmp/fw.bin boot

. Firmware for these devices is typically distributed through ISPs (like BSNL or Railwire) or specific vendor support portals rather than public direct downloads. Device Specifications D401 Onu Firmware

The firmware is the specialized embedded software that controls the hardware functions of this fiber-optic terminal, bridging the gap between a high-speed fiber connection and local user devices . Typically manufactured by companies like FiberHome or Netlink , the D401 is an XPON device—meaning its firmware is designed to be "dual-mode," supporting both GPON and EPON standards. Core Architecture and Purpose # From ONU CLI (Telnet/SSH) tftp -g -r D401_GPON_V3

These devices generally feature: