Huawei HG556a Version C / HG56BZRB VER.A / Ralink RT3062F Original Firmware?

Hello dear community,

i successfully installed the OpenWrt 18.06.6 Firmware on my device. I wanted to install a home repeater. I was successfully actually but somehow it is instabile. So i use instead a AP from TP Link (wd701nd).

So i wanted to install the original firmware to the Huawei device but i did not secure the original firmware. On the web page of vodafone spain i can not find a firmware. Either on the google.

Does someone have a idea how to find the original firmware for the "Huawei HG556a Version C / HG56BZRB VER.A / Ralink RT3062F" device?

Thanks in advance!