I cannot recall what exactly I used to resurrect the pins/“teeth”. It wasn’t anything professional, maybe a jack knife blade or even a breakfast knife blade. – And regarding the camera zoom, it’s mainly a suggestion to use the zoom as a magnifying glass to “explore the area”.
By the way, I still found three (strongly cropped) photos from back then that illustrate what I described. Photo 1 is the “before” state of the connector band end, photo 2 is the connector band end after my (quite imperfect, but eventually fitting) “fix” and photo 3 is the corresponding midframe counterpart.
Bear in mind I’m not a Fairphone employee, so no guarantees from my side here. 