The black thermally conductive adhesive transfer tape, and the copper sheet that you can see on the first picture of step 19 hasn't been removed in this teardown, which I can understand since it's just impossible to remove without tearing the whole thing.

If you want to replace your midframe, though, you need to have this on the new bezel.

My trouble is I've searched the web without being able to find where to buy this thermally conductive adhesive transfer tape. So if any of you guys could drop me a hint ...