Ok, so what navcore is currently installed on your device....it should be 9.510? If not you can install TomTom Home software as it will backup and update the device for you.
Now you've read the tutorial, you've obviously only downloaded maps that can be activated/are compatible with your navcore/are small enough to fit on your device?
There is only one Europe South West Europe 985_8155 map with a meta code already released but I think it is too big to fit on your device at 1.3GB so probably the most suitable map that does have a meta code released and is small enough to fit is: Europe_South 985.8208