Son updated his Iphone 5 to the latest IOS 10?.
Anyway he now has no rear facing camera, he has tried other app's and went for a visit to the Local Apple store tech guy.
Apparent Tech guy stated as you have had a screen replacement this latest update can stop the camera from working.Basically tough I cannot do anything.
I wish I was there as it was wifes and friends before and no screen was replaced
So any ideas anyone of my Apple knowledgeable friends.
Have googled and some suggest re installing an older IOS, is this possible and how would I inform him how to do this?

If I cannot remedy this problem then I will be paying out for a new phone for him,him being a student and having no money (even though he's off skiing in December with the UNi

)