It could be the new map is too large to fit on the SD card in the 510, what capacity card have you got installed and is the UK&ROI map region you are trying to update or somewhere else?
When new:
510 = Regional mapping (SD Card)
710 = European mapping (SD card)
910 = European & NA maps (20GB internal drive)
The problem is the NA map won't fully download I get "invalid archive”. I had no problem downloading the same map for my wife's 730. TT told me the problem is on their end. I have used two computers one hard wired.
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