Yes, it is possible to disable the Wi-Fi. To do so, please follow the steps bellow.

 
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Please note that to reactivate Wi-Fi via the module’s user interface, you will have to connect via an RJ45 cable. The other solution for reactivating Wi-Fi is to reset the Powerline Wi-Fi using a paper clip until the LEDs flash. All the devices that were connected to the Wi-Fi network will be automatically disconnected.