Go to the tutorials section and read the following threads on how to activate the latest maps on your device:
7 simple steps to update your device with the latest map
TUTORIAL: Clean Install - How to install the latest map and navcore from scratch!
Updating TomTom - patching navcore and maps
Try the first 7 steps tutorial first. If that fails, try the clean install tutorial. The 3rd tutorial (by jarkita) tells you how and why, so it is very informative.