Maps no longer work after checking for updates
I have a TomTom XL with a GJ serial number. We bought it off eBay some 18 months ago for our holiday in the USA at the start of this year. It worked fine there, it worked fine here in the UK. It has three sets of maps: UK, USA and Greece
The other week, out of interest I plugged it into the PC to check for any updates, there were none of course. Now, when powered up, it presents a list of those three maps but on selection of any one advises "You cannot use this map on this device: "UK 101437” same goes for "USA 101487" and "Greece 101059".
The device does still contain those map files
I have backed it up to the TomTom site, reset it, downloaded the maps again. No change
I have pressed the tiny reset button. No change
I have held the on button for 30 seconds. No change
Run out of ideas.
Short of jumping up and down on it, any ideas how to fix it?
Looking forward to an informative reply