Using the spudger, start to gently pry the motherboard from the back of the phone and work your way around the perimeter of the motherboard.
There are copper ribbon cables connected to each side of the motherboard leading to the buttons for volume control and the camera that need slid out of the phone casing as the motherboard is being removed.
There are three in total, but do not remove the top one from the phone casing yet.
Using a desoldering braid and a soldering iron, remove the soldered connections. Use the website " はんだ付けとはんだ除去の作業ガイド " for more information on soldering.
When attaching the new charging port, use the solder and not the desoldering braid to make the conection.
You will need to coat the boxed area with flux liquid and then heat it with a heat gun while gently prying the charging port with the micro soldering tweezers. Use the video https://www.youtube.com/watch?v=jGZKsuaJ... for more information on micro soldering.
Make sure to watch the video to see how to micro solder the new charging port on.