@Manuel6 The setup is mostly working fine for me too. I am connecting the two routers via an ethernet switch. I had to go to my switch settings and disable loop prevention. I found this solution by...

@Kevin_Z After using it on AX 53 V1 for some time, I have noticed the following issues. For some reason, the ethernet backhaul is disconnected and it is doing a wireless backhaul, I changed the ports...

@Manuel6 Its there in the list of devices supported, the #1 post

@Kevin_Z I was able to install the beta firmware on my two Archer AX53V1 works fine for me with Ethernet backhaul now. Thank you! Pair of Archer AX53 with ethernet backhaul