Flipped UVWs in 3ds max

Hello I am making a chair in 3ds max, the pillow of the chair contains many flipped UVWs. I fixed many of these UVWs by mirror subobject selection in unwrap UVW map editor. But some of them remained unfixed still the amount of the flipped UVWs in the pillow didn’t reduce to zero. How can I totally fix these flipped UVWs?