The method of replacing the back shell is as follows: First, shut down, take out the SIM card, and take out the screws on both sides of the data cable interface. Use a suction cup to hold the part of the screen near the Home button and pull out an opening. In order to avoid short circuit of components during the disassembly process, power off the motherboard first and remove the shielding cover of the power connection cable.
Note that the Angle between the front panel and the fuselage should not exceed 90 degrees, as there is a line connecting the two at the top of the fuselage
Replace the back cover of the iPhone: Turn the phone off, remove the screws, and remove the back cover with a tool.