Sunrise Connect Box 3 - F@st 3896 LG

Hello OpenWrt community! I am a new joiner :smile:
I got this device and it looks like it is unsupported device.
What can I do now? I would like to learn how to build a firmware for it.
Am I dreaming? Should I just wait untill my device is supported?

Thank you for you inputs, have a great day.
Boris

https://openwrt.org/docs/guide-developer/add.new.device

Thank you frollic !