Manual: you have an optional "Winter" filter. "Winter" meaning in conditions where ice can form on the flocked filter (freezing fog etc.), which isn't all that common. It was never shipped with a saw in the USA, and is worthless in fine dust conditions. The dirt you see inside is exactly what I see on the MS200T with guys that insist on using that filter (because they like to pour gas though it to clean it).
As I'm sure you've now seen, the "filter update" was just to remove the two big tabs at the bottom of the filter, not the material.
Get a fleece filter... and make sure the locating posts are not broken off on your backing plate. The clamp knob should be looked at also. A smear of petroleum grease around the lip will seal it if you have any problems