The updates are smaller drive sprockets on gathering chains,shorter lugs on the chains, and if you have knife rolls there is a new design on the knife plus longer bolts to hold on the rolls. These updates should have been done on all first year heads. The update was done to help the head pick cleaner ie: less trash going into combine which increases capicity. If these mods do not help get the trash out I suggest putting on fluted rolls and slowing head down.