I've alerted Luke to this issue. It may be that they need to make a change to the material before going ahead with the final PinePhone production run.
Also, to anyone who has a Braveheart, given the probable fragility of your back cover, my advice is to run your fingernail around the entire back to achieve separation before removing the back ... gently.
Also, to anyone who has a Braveheart, given the probable fragility of your back cover, my advice is to run your fingernail around the entire back to achieve separation before removing the back ... gently.