I have just bought an Archer AX1800; I already had a RE330 which I was using as a simple Access Point connected via ethernet to main router.

I've now replaced the router with the Archer AX1800 which I bought because of the EASYMesh feature.

I tried setting it up by connecting the RE330 to the AX1800 via an ethernet cable, then following these instructions

The satellite device shows up as connected via ethernet but after a while everyting stops working; devices wirelessly connected to the main router start having problems and the main router setup page is unreachable even via ethernet.

It only starts working again if I physically disconnect the ethernet cable connecting the RE330.

I've tried multiple times. I even tried without the ethernet cable: the main router keeps working, and the satellite device appears connected via wireless (wireless icon shown instead of the ethernet one), but there is definetly no wireless netowrk being extended around the RE330.

It only works in dumb access point mode, which is what every router/repeater has been doing for the last 20 years.

I cannot believe this can be so bad in 2024. I must be doing something wrong, what is it?