LEGO model's shading problems in game

lego models usually look good in blender but in some games they look very different.
models look terrible.
i checked direction of faces.


drive.google.com/open?id=11T1Xmt7x_TQb-28n5RTma0tS-lZxpqtp second image
these on screenshots were converted with LDView to .stl then rotatated and moved to center with BLENDER. but i tried many times and nothing was working

EVEN when i flipped wrong faces it still was bad