Carefully pry the cover away from the phone.

This may take a lot of force if the adhesive in the middle is still attached. As you lift the cover, you may need to use an opening pick to slice through any remaining adhesive.

To reinstall the back cover:

First use tweezers and a spudger to peel and scrape away any remaining adhesive from both the back cover and the phone's chassis.

Then, clean the adhesion areas with high concentration isopropyl alcohol (at least 90%) and a lint-free cloth. Swipe in one direction only, not back and forth. This will help prep the surface for the new adhesive.

Replacement adhesive comes in a pre-cut sheet to match the exact contours of the back cover. If that's not available, you can use a high-bond double-sided tape, such as Tesa 61395. Before installing the precut adhesive on the back cover, remove the metal insert. Install the adhesive, then replace the insert.

After installing the back cover, apply strong, steady pressure to your phone for several minutes to help the adhesive form a good bond.

If desired, you may reinstall the back cover without replacing the adhesive. Remove any large chunks of adhesive that might prevent the back cover from sitting down flush. After installation, heat the back cover and apply pressure to secure it.