Hi, I have a 2007 Expedition Limited with factory navigation, rear dvd, Sirius, etc. HW: 7L1T-18K931-CB SW: 3.040000. Where can I find if there is are any software updates for this device, and what has changed in the updates? Also, if there are any updates, would I be able to do it, or would the dealer have to do it? And, will there be a dealer charge to patch it, if there are any updates? It works ok, but looks outdated. Besides, updates are *usually good! I'm temped to put an aftermarket Nav with rear camera, but worried about the rear dvd player contol. Thanks!