These look remarkably similar to the Cudy WR1300.
https://www.cudytech.com/productinfo/90088.html
Here's the development thread:
https://forum.openwrt.org/t/cudy-wr1300-support/67593/146
If you have one in your possession you may want to get in touch with @pyckle. He submitted the Cudy WR1300 build
The older versions have a CVE:
https://www.cvedetails.com/cve/CVE-2021-43284 that should be mitigated by an OpenWRT build.