Yamaha AV Receiver RX-675 sound issue

magpiexv

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Hi I’ve had my Yamaha Av reiciver rc 675 amp for while (always had Yamaha so thought I knew a bit about them) I’ve seem to lost all sound and the digital display on the amp screen is full with all alluminations and was worst is it was working the night before and now nothing if tried changing different setting different connections (hdmi,optical ) and still nothing checked cables speakers . I looked on forum and people said try firm wire update but can’t seemed to find in the menu how to do that! Or reset I think could be more aerobic I’m willing to the firmware update if I. Know how or reset can anyone help or had simuproblem
 

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