Medion LIFE S47018 Mode D'emploi page 623

 Press the QP1QHH button repeatedly to select the tick
symbol.
 Press the shutter release button to confirm the factory
reset.
 In order to exit the menu, press the QP1QHH button
again until the EXIT option appears and confirm
your selection by pressing the shutter release button.
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OK DEFAULT SEL
OK EXIT SEL