remove the profile but the camera always be disabled
Did you remove the Profile from the Device settings or through the Apple Configurator?
Many times even if you remove profile from Device settings, its still there in the Device.
You can see if its still there in the Device using Apple Configurator and try removing it from there.
I have a strange problem at my iphone, 
when  I remove the mdm profile, 
the camera always be disabled, it's not come back , the mdm profile is only one , how to reset it?