On Monday, I installed the map for the USA and Canada on my TomTom Rider 410. This used up all the available memory in the unit (all bar 11 Mb). On Tuesday, I installed a 16 Gb memory card (successfully). I then updated the 'Europe' map, but when the download completed all I have is the blank outline of Europe (and the rest of the world, all bar the USA and Canada, for which I have a functional map). Searches for addresses in UK (where I am based or the rest of Europe fail to find anything (but do show up similar addresses in the USA and Canada).
How do I fix this? Is the only option to uninstall the Europe map and reinstall it?