: Incorrect firmware can permanently disable the device.
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Launch the Huawei ONT Firmware Flash Tool ( ONT_multicast_upgrade_tool.exe ) as an Administrator.
The LAN port light will flash rapidly during data transfer. Eventually, the WPS/WLAN or Power lights will blink sequentially, indicating that the device is writing the data to its internal flash memory.
This is a more advanced method used when the web interface is locked.
If you decide to use any Huawei ONT flash tool, always triple-check firmware compatibility (hardware version: e.g., 4B, 5A, etc.) and keep a TTL serial adapter ready for recovery.