Ok guys it's been a few years since I've been on here just barely got a car that has the avic f900bt in it back up and running and wanting to update to the most recent firmware, on pioneer's site they are only showing a ver of 2 still, I see an install guide for 3.0 and then mods for 4.0 but can't find a thread with the links for 4.0 so I was wondering if a 4.0 install guide can be stickies so for those of us looking to come back and get the most up to date version don't have to spend a couple hours sorting through years worth of threads. I'm hoping a mod or vet of the forum can post a link to