After a bit of google, it looks like there is a workaround. :)
https://github.com/jacklul/asuswrt-scripts
Haven't tried it but looks like it is going to work.
@Tech9 do you have an experience/example what to write in the script?
Was reading about USB-method described here, will this work?
https://www.snbforums.com/threads/how-to-automatically-run-a-script-on-asus-routers-that-monitors-your-wan-link-will-reboot-the-router-if-wan-is-down-from-pov-of-a-non-linux-guy.74336/
I just got the TUF AX4200 (3.0.0.4.388_33506-gb8edbc3Revert) and was about to set up guest network, but unfortunately I saw that its not possible to set up guest network with my own specified Ip-range, nor was it possible to reserve ip-adresses for specified devices (MAC-adress). Also I wanted...