[How to install armbian in h618?]

Hello, sorry for my very bad english. 

I have a Vonstar H618 box, I can't find firmware support for it in this list https://github.com/ophub/amlogic-s9xxx-armbian/releases?ref=armbian.io

I have downloaded the original firmware from the vontar homepage https://www.vontar.cn/pages/download.

I hope everyone can help me install armbian on my device. Thank you very much