Friends, take a very, very close look at how the connector on the replacement screen is situated. It rests BEHIND a small L shaped ledge that holds it in place. Once connected to the home button ribbon, you will need to seat it behind the little ledge. Otherwise it will be sitting on top of the ledge, and the metal cover won't fit properly before it is screwed back in place.

This step of separating the two parts of the phone deserves careful consideration. In my case, I had propped up the display assembly with a box and rubber bands. However, only 2 of the battery adhesive strips came off easily. The effort to remove the battery with the display assembly attached was not a good move on my part. I jarred the ear speaker cable and after reassembly I had no camera or working ear speaker. Taking off these 5 screws and removing the three cables is not difficult. My suggestion: is you have ANY trouble removing the 3 battery adhesive strips, STOP, separate the two components, and then continue with the battery removal. Don’t struggle removing the battery with the display assembly attached. (I replaced the ear speaker cable, and all is working now)