No ot make you mad Lostimate but :
Looks like an old low poly model with low res texture.
You need highter resolution textures.
And sorry but the shader effect is not very noticeable !!

For Blender a fast ,easy solution is in Gimp :
-You turn your normal map to Black and White depthmap.
-You invert colors
-You turn it to normal map.

Well, Blender is special or is it A7 that have a special normal map shader ?