..............and these guys had the black boxes. Imagine what kind of report we'll get when it comes to AF 447.
The equipment failure possibility is VERY remote. The investigation was able to find out what happened, but it's impossible to know why one lever was on "reverse" and the other one was on "climb". The report suggests that most likely the pilot did a mistake. Anyway, the report has several recomendations that will help to prevent another crash like this one, it doesn't matter if it was a pilot error or a equipment failure...