Furuno FCV-588

I bought a FCV588 three years ago. Used for one season and then removed from boat. Reinstalled to a Plymouth Pilot 18 in UK waters - first outing today. All very good for first three hours and then the screen lost all sensible content - no picture and side depth showing to 600 ft in only +- 40ft of water. Is it possible to do a factory reset on this model? Suggestions please. Thank you all best Rob
 
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