Chosen Solution

where does this rubber ring go back to? i removed the logic board and this popped out and i couldn’t figure out where it goes. is it underneath the gold screw with the hole at the top of the head? (the only non-philips screw on the inside of the iphone? you need a flathead for it) Thanks

Ok, so it’s not the back camera

Are you sure its rubber? That looks like the camera lens.