My phone had a substantial amount of adhesive between the copper area on the back of the display assembly (see pic in step 10) and the frame (see pic in step 13). There was no way to have known that as I started to remove the glass, but this made it difficult to lift the glass up and eventually led to the glass cracking as I tried to work the plastic opening tool up along the side of the phone (about in the spot shown in the second picture of this step). In hindsight, I think it would have been extremely difficult to remove the front glass undamaged without first starting to separatie that adhesive from the frame, but I’m not sure what would have been the best way to do that. My guess is I would have needed to slide a tool with a thinner/sharper edge upward from the bottom while pulling on the suction cup to start separating the back of the display assembly from the frame, and worked on both that and the edges of the glass at the same time.