I have the same issue (RT-AX86U Pro+RP-AX56) and followed the steps as below then it's done.
1. save the settings on the router : https://www.asus.com/tw/support/FAQ/1001376/
2. do the hard factory reset: https://www.asus.com/support/FAQ/1039074/
3. re-upload the profile saved in 1.
Hope...
I would recommend the ASUS ZenWiFi XD5 for your friend's needs, which is more affordable than GT-AX6000 that still offers excellent performance and reliability. Its mesh network capability allows it to work seamlessly with other ASUS routers in an AiMesh setup. This means that your friend can...
Perhaps they heard you? I checked the page and ROG Rapture GT-AX6000 appeard. lol
https://www.asus.com/us/networking-iot-servers/wifi-6/all-series/filter?Category=WiFi-Routers&Spec=728
ET12 is a mesh system which meets your need for wide coverage. RT-AX86U may be a good option if you are primarily concerned with reducing latency and improving performance for gaming and other high-bandwidth applications. It depends on your budget and which feature is more important to you.