Simple -
Unscrew the 2 large screws and open the back. You'll see a silver 'flash' card slotted in. You just swap that with a new card obtainable from Harry Mendelsohn or from Bendix/King themselves
Cost around £80 when you send back the old card. I took mine to Air Expo and had it done on the spot.
I forgot to quote my previous post
thanks again! Is this a fair price and maps with airspace boundaries for VFR / IFR flight ?
Database Update For Skymap IIIc Topo.