When removing the back glass adhesive during this step, be very careful not to damage any of the fragile components near the perimeter of the frame.

Use a spudger to scrape up and remove all the old back glass adhesive from the perimeter of the frame.

This will take some time as the adhesive can be tricky to remove. Work slowly and try to roll the adhesive onto itself.

Once you've removed all the old adhesive, use isopropyl alcohol and a microfiber cloth to clean up the adhesive residue from the perimeter of the frame.

In order for the new adhesive to form a good bond, the frame needs to be completely clean of all adhesive and its residue.