You cannot download the correct "Huawei 5V5 firmware" without knowing your exact model and current build.
: The hardware typically features status lights for Power, PON (Passive Optical Network), LOS (Loss of Signal), LAN1-LAN4, TEL, USB, WLAN, and WPS. huawei 5v5 firmware
– it does not exist officially. Instead: You cannot download the correct "Huawei 5V5 firmware"