Shader doesn't work on device

Hi guys,

I downloaded a shader package from asset store for rendering high quality 3d model.
Here's where I got it from: https://www.assetstore.unity3d.com/#/content/8257

The shaders are great for metallic and plastic finish on the 3d model. However what's bizzare is that it works great in the editor but when I build it on my android device, it looks as if there's no shader at all! It looks like a plain diffuse lighting

I've never seen such a thing before! Is anyone familiar with what I'm seeing here? Any input will help.

Thanks