@byrallier AX90 supports Onemesh technology. Here's the difference between different TP-Link mesh technologies. The main goal of a mesh technology would be the seamless roaming between different...

@I-Data How about this guide - I believe that's the guide what you're looking for.

@I-Data This seems to be a universal configuration guide - there's no device models pointed explicitly like in this example: Do you have any issue sfollowing the guide ?

@Louis_A Can you post the AX5400 Nework Map screenshot here:

@Nemoadest Good job. Refer this thread for MR600.

@JustMeThree On the device bottom sticker is printed the exact router model, FW region and its HW version - details. Can you post this info here ?