Sometimes when the model in Blender, normals go haywire.
Any attempt to fix the normals recalculated outside or inside, fail.
This is the case exemplified in the image below

Just go on Object Mode select object and press keys Ctrl + A.
In that case, you’ll be forced to reset transformations ( Ctrl + A -> Scale and Rotation to ObData)
See the next image:

Next, go on Edit Mode by pressing the TAB key, and you will see the result.

… and I solved the problem.

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