Tenda OS3 5.8GHz Outdoor CPE how to install OpenWRT?

I have an interesting Tenda OS3 AP with 4xLAN ports, but I couldn't find any information on how to install OpenWRT on it. I also don't know what chip it has and how much RAM/FLASH it has.
Has anyone installed OpenWRT on it yet? Please help if you know anything.
Thanks.

The only supported tenda device is the ac9. There is no way to install openwrt onto any other tenda device.

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Your router is based on siflower platform that is not supported by mainline linux.

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It's very sad to hear, apparently a very reliable and useful device, and not very expensive. I haven't bought it yet, I'm just studying it. If anyone knows, tell me how the standard firmware works? Is it worth buying, in particular for video surveillance. The distance between points in direct visibility is 500-800 meters. What kind of seaflower is in this device? One of them already has support in OpenWRT, if I understood correctly is written here

That is not built by default, which means if you want to port to device you will need to fix lots of things.