Force the Home + Control App to close and make sure it no longer works in the background.
Turn off the power of the Legrand smart gateway during 10 seconds, then turn it on again.
Open the Home + Control App, select ‘’install a new home’’ and launch the configuration mode again.
Check that the Legrand smart gateway indicator briefly lights up in green when pressing the centre of the Home/Away master switch or the gateway module button, and follow the instructions.