# Blender 2.9: Problem With : Flip Normal Faces

When I Export (.fxb) file to (unity 5) i find out faces was flipped,

when i go back to blender to fix it , i found out when i do (Alt+N) for flipping normals its just flip one face side and the other face side is not visible

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You need to disable backface-culling in Blender and Unity.
I have not used Unity in a long time; but I think you need to toggle the option cull-off found in the SunShader section I believe?