Re: RNS 510 mutes sometimes..
From the part numbers you cannot tell the FW version.
However the car dealer gave you the V7 which can only be used in unit NOT fitted with 3xxx firmware
And the FW is never supplied by the dealer, the cd's are not for sale and the DVD only contains map data
The unit obviously has developed an error, a serious one I suppose and it sounds like a defective motherboard
I would immediately claim guarantee
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