maru: Using "Color Correction", as you turn to advanced mode and will have the option to change the gamma.
About my previous comment, I confuse, in realy I made a de-gamma, as the texture is 8bit she is not linear, this gamma 2.2 was embedded. The Normal map shader of Corona asks for it not be done, as I said the render is wrong but the problem disappears, which made me think that may be associated with the color space.
lacilaci: I have not changed the subdivisions of the model, when we use normal map subdivisions should not interfere with the final result, remember that it is used also in low poly models. And the gamma is directly connected to the correct result of the normal map, when working with 3ds max linearized you need to make a de-gamma in texture of normal map for it to work properly.
I even tried to use a texture linearized but had no effect, I prefer no more try guessing the problem, kkkkkkkkkkkk