That doesn't mean that the official OpenWrt project supports your specific device. They probably took (an old version of) OpenWrt and then customized it for their purposes.
Are you able to gain access to the command line after that device boots? If so, what do you see on the output of:
Just because they mention the project doesn't mean it is supported.... it's a completely vague statement "OpenWrt Project" -- it doesn't say what they've done or if they've used it on each of their products, and it doesn't say that they've open-sourced and upstreamed their customizations or actually worked directly with the OpenWrt dev team.
Chances are that they've locked it down, which mean you'd need to do much more to discover the complete details of the device (including the chipset and other stuff) as well as figure out how to install any alternate firmware onto the device in general.
You can ask the vendor, but there's nothing to be done here on these forums until you have answers to the above.
true maybe they take openwrt name just to show how good they are...
looking at the kernel v i assume it have many vulnerability so if it supports openwrt i will flash that like my both routers... but it does not seem like that.