I recently decided to add voices to my TomTom One XL (v9). It took me some time, but got it working.
Today I decided to update my maps. Everything was geniune before I added the voices.
What I did was copy over the new maps (Southern_Africa_910_4892) into the Southern_Africa folder on my device (really takes forever to copy - hours). I deleted all the old map files out of that folder (except I left the ...