Windows Phone 8 hard-reset goes like this:
Turn off your phone.Hold volume-down.Keep holding volume-down and press power button for about 3 seconds.Let go of the power button, but keep holding the volume down until image/icon on the screen appears.
Almost done – now proceed with the following sequence:
Let go of holding the volume-down and press:
That kicks the phone into a hard-reset sequence, which should take about 40-60 seconds.
If you did all of that correctly, the phone will take you to the “Welcome to your Windows Phone, let’s get started screen.”
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