Heat the perimeter of the display to soften the adhesive securing it.

If available, use a hot plate or heat pad. Place the Essential Phone face-down and heat it to 85° C for at least 15 minutes.

Otherwise, use a heat gun to evenly heat the entire perimeter of the display until it's too hot to touch. Try to maintain a high temperature for 15-20 minutes—but beware that without exact control over the temperature, you can easily destroy the display.