For updates to the Terrain information on the Entegra's (EX5000, EX500, etc.) please contact Jeppesen.
The terrain update can take upwards of one and a half (1.5) hours, you must have an external power source. If power goes off during the update:
The EX500 - your shop will have to call Duncan to have the unit sent in for service.
The EX5000 - your shop will need to contact Tech Support for a new compact flash card.
You will have to start the entire process over, once your Entegra unit is updated and back in the aircraft.