Hello, hopefully someone will be able to help me.

I was given a Garmin C510 Sat nav recently and asked to update the map on it, i added a sd card and tried to update it via my Garmin account, unfortunately it didn't work and now i keep getting the error message 'no valid maps' etc.

The unit worked before albeit on an old map, and i stupidly didn't make a backup.

Is there any way i can get it back to it's original working state, even if it's on the old original map?

Thanks for looking.