You could also try to mess around with a Edit Normals modifier.
Though an easier way might be to export it out of Max as a obj file, there should be a option to export without the normals information. Then just re-import it, that should reset the normals.
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Though an easier way might be to export it out of Max as a obj file, there should be a option to export without the normals information. Then just re-import it, that should reset the normals.