This step is directly handling the mother board of the iPhone so i can not stress this enough, be careful. first you want to proceed by removing two screws, one flat head and one Philips, the Philips screw is hidden under a water sensor that can be scraped off. The photos below will show you the difference. after you remove those screws and organized them in you sketch begin by freeing up the top of the mother board from the ribbon cables up top. then slowly take it off. proceed with caution.