upgrade iphone 5 camera

These devices are not meant to be modular...you can't just open it up and pop in a different camera or speakers or microphone. If you need a better camera, buy a different device with a better camera.

Upgrading the camera would require a hardware change. Such as replacing the iPhone 5 with an iPhone 6.

I would have to say that it is not possible to change the camera in an iPhone. I have never seen any posts here in all the years I have been here of anyone reporting that they replaced their camera.