How to remove/chnage in-Car CD/Cassette Player in Nissan Primera ?

I have a problem in removing the old Cassette Player in Nissan Primera !

I could find only find 4 Phillip-screws to remove the middle of the Dash board but still the Dash board doesn't come out. Also I tried to pull out the Cassette Player but it has been firmly fixed and doesn't come out. How to get access to other screws or clamps if there are any that fixes the Cassette Player ? I even tried to find for other fittings by removing the Ash-tray and small box above but couldn't find any other screws, fittings or Clamps.

Can some one help me ?