@kleem It is normal that changing the operation mode also results in the IP address changing. To find the new IP address you will need to check again on the main router to which the AP router is...

@kleem Hi, If you have more than one TP-Link router and http://tplinkwifi.net opens the login page of the "wrong" router, then you need to use the LAN IP address of the router you want to access...

@Var_M Well, then just test whether WMM disabled makes any difference. If it doesn't, then set it back to enabled. You can also try the 2.4 GHz settings "Channel Width: 20 MHz" and "Mode: 802.11b/g/n...

@RVeir Ok, that's good. Can you please share a screenshot that shows how you've set up the port forwardings for WireGuard and/or OpenVPN on the ISP router?

@RVeir Hi, Is the public IP address that is shown inside your ISP router identical to the IP address shown by canyouseeme.org ? Have you also tested the OpenVPN server of the AXE5400 ?

@Dreamrony69 Hi, Can you please tell us what Wi-Fi speed you are currently getting and what higher Wi-Fi speed you want to achieve?