The bad news is that Max is not backward compatible to any version -it's only forward compatible from earlier versions.
That said, you might be able to export your model (I don't think you're going to get lights or cameras or anything but the model) as a .obj or .3ds, and then open that in the earlier version. You might also try Collada or FBX exports. The changes from one Max version to the next are always so massive that it's impossible for them to maintain backwards compatibility. Good luck!