Material caused Iphone 7 compatibility issue

Hi, I’m new here, come for help!
I have two links:
Testhdr.html: Adjust roughness and Metalness to see the correct results.But the 3D metal on this page doesn’t work in the Iphone 7.
TestHdr2.html: Adjust roughness and metalness results incorrectly.That’s right for the Iphone 7.
How can I get the right results on an Iphone 7(roughness and metalness)
Does anybody know the solution?