Before you start following the steps for the WL WN532A3 AC1200 Router Setup, you should reset the router. As the factory reset erases all the previous settings and allows for a fresh start. To reset the router first find out the reset button. It is usually present on the rear panel of the router. Now, press and hold it down for a minute or until the LED light fades away completely. Now let’s get started with the first setup method which is app based.