@nicholas_lai Deco M9+ could serve as a router and probably should be able to replace the EX510 as a main router. Check that with your ISP and if it fits their service then the EX510 will be...

@Gustsax Resetting the router to its factory defauts shoud be able to let you regain back the access. To reset the router press and hold the reset button for about 10 secnds.

@Overtech_NC Disable UPnP, reboot the router and try again:

@NevaBear Usually the guest network settings can be found here:

@sajidgg7890 It's more like: 1.Create a new TP-Link ID 2.Unbind the old TP-Link ID 3.Bind the new TP-Link ID N.B. If you decide to sell the device at some point in time, you shoud unbind your TP-Link...

@acuponctus No at all. You can always switch to a 4G connection if you decide that and replace the AX73. Meanwhile AX73 can be your main router and the PX50 should work in AP mode to avoid the double...