@Moustacois Follow this guide to make sure that you have configured the Parental Controls feature properly. A correct system time setting is essential too.

@Graveyard I can't speculate if your router models are going to be updated with this feature any time soon, but the updated solution is from a month ago - here.

@Moustacois To be able to set the Parental Controls to work properly, you have to make sure that the laptop and mobile in questiion are not using a randomized MAC addresses - details. Keep in mind...

@Rick115 Reset the AX5400 Pro to its factory default settings by pressing the reset button for about 10 seconds. Then use teh WPS button method to build teh Easymesh - details.

@IVW Here's how to change your wireless SSID via Tether app. You can do that via router WebGUI in Advanced/=>Wireless settings Keep in mind that if you want a separate SSID for 2.4GHz and 5GHz bands,...

@Salty0299 This feature is not implemented yet for your router models - more details in this feature request.