How port openwrt on Avxav modem?

I have a LTE router which is this model:
I am beginner with routers and I want to change some of it's configuration and I need to change it's firmware and port OpenWrt on it.
Would you please help me?

That device is not supported by the OpenWrt project. It may be possible to add support, depending on the hardware details. You can start the investigation by determining what chipsets are involved, how much ram and flash memory is included, and other important details.

See this article for how to get started:

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Thanks regards!