Hi, I have an RT-AX59U. Looking at the forums, I'm guided to this webpage https://openwrt.org/toh/asus/rt-ax59u which says download the trx from a google drive - but be wary.
I've configured my 1st RT-AX59U as a dumb AP. I'm on VDSL with BT SH2 establishing the session. Also added the WAN port to the LAN bridge. When FTTP arrives, I'll "reset" it through the GUI and use as a normal router.
Off topic:
I can see wireless clients connected on the Status page. Is there a way to give them a meaningful name e.g. Iphone, Ipad? Also, I cannot see any cabled clients.