Do you know if GL-AX1800 can be flashed with openwrt? Not on official device list.
This post details a community firmware with images: https://forum.openwrt.org/t/gl-inet-ax1800-new-router-openwr...
That community repo is a fork of the GL.iNet build infrastructure repo, just with less definitions that allow compilation to succeed.
My understanding is that infrastructure fetches the official owrt sources and applies the patches listed in the yaml files, but I didn't audit the entire build system in 15 minutes :P