Power off your iPhone before beginning disassembly.

Remove the two 3.4 mm pentalobe screws at the bottom edge of the iPhone.

Measure 3 mm from the tip and mark the opening pick with a permanent marker.

Heating the lower edge of the iPhone will help soften the adhesive securing the display, making it easier to open.

Use a hairdryer or prepare an iOpener and apply it to the lower edge of the phone for about 90 seconds in order to soften up the adhesive underneath.

Apply a suction cup to the lower half of the front panel, just above the home button.

Pull up on the suction cup with firm, constant pressure to create a slight gap between the screen and the frame.

Insert an opening pick into the gap.

Slide the opening pick up the left edge of the phone starting at the lower edge and moving towards the volume control buttons and silent switch, breaking up the adhesive holding the display in place.

Stop near the top left corner of the display.

Re-insert your tool at the lower right corner of the iPhone, and slide it around the corner and up the right side of the phone to separate the adhesive.

Gently pull up on the suction cup to lift up the bottom edge of the display.

Pull on the small nub on the suction cup to remove it from the front panel.

Slide an opening pick underneath the display around the top left corner and along the top edge of the phone to loosen the last of the adhesive.

Slide the display assembly slightly down (away from the top edge of the phone) to disengage the clips holding it to the rear case.

Open the iPhone by swinging the display up from the left side, like the back cover of a book.

Lean the display against something to keep it propped up while you're working on the phone.

Remove the following four tri-point Y000 screws securing the lower display cable bracket to the logic board:

Three 1.2 mm screws

One 2.6 mm screw

Remove the lower display cable bracket.

Use the point of a spudger to lift the battery connector out of its socket on the logic board.

Use the flat end of a spudger or a fingernail to disconnect the two lower display connectors by prying them straight up from their sockets on the logic board.

Remove the three tri-point Y000 screws securing the bracket over the front panel sensor assembly connector:

One 1.3 mm screw

Two 1.0 mm screws

Remove the bracket.

Disconnect the front panel sensor assembly connector from its socket on the logic board.

Remove the display assembly.

Remove the following two Phillips screws securing the barometric vent to the rear case:

One 2.9 mm screw

One 2.1 mm screw

Gently push the barometric vent in the direction of the Taptic Engine to separate the adhesive securing it to the bottom edge of the iPhone.

Remove the vent.

Use the flat end of a spudger to disconnect the Taptic Engine connector from its socket on the logic board.

Remove the three 1.5 mm Phillips screws securing the Taptic Engine to the rear case.

Remove the Taptic Engine.

Peel back the three adhesive strips on the lower edge of the battery.

Slowly pull one battery adhesive tab away from the battery, toward the bottom of the iPhone.

Pull steadily, maintaining constant tension on the strip until it slips out from between the battery and the rear case. For best results, pull the strip at a 60º angle or less.

Repeat the previous step for the second and third strips.

If you removed all adhesive strips successfully, skip the next step.

Otherwise, if any of the adhesive strips broke off underneath the battery and could not be retrieved, continue with the next step below.

After about a minute, gently lift the battery.

Remove the battery.

Adhere the battery, disconnect it, and continue reassembling your device.