First, follow this tutorial:
1. If you want to use the official navcore for your particular model, then simply download all the updates from TomTom HOME until there are no more updates. Otherwise, you can continue using any version 9 navcore if it's working well and you're happy with it.
2. No, you can continue using the navcore you already have.
3. Australia maps are 875.3613 or 875.3615 - both links found in the tutorial mentioned above. The 875.3613 is the latest full featured map that is recommended for your model.
4. Not correct. See above answer.
5. Impossible. Navcore v10 can only be used with the new TomToms which use a different file system. See this thread for more info:
6. The whole process could take anywhere from 10 minutes up to 1 hour max, depending on your download speed and computer speed.
7. Look in the menu under Version Info. This will give you most information you need. To find out what is your exact model, you can check on the TomTom support website, for eg here:
Bookmarks