Error 4013 Iphone X Solution. At the time i didn't have the tools to resolder those connections but i was able to cut a piece of a business card and place it in between the lcd/digi/prox flex's and the shield that holds them down. Welcome to apple support community.
So i had this same issues, read your solutions here, disconnected the earpiece and phone booted up fine. Quick press the volume up button > quick. Release the power button but keep holding the home button.