Use a heat gun to lightly heat the edges of the back to soften the adhesive that connects the back cover to the rest of the frame.

An iFixit iOpener, hair dryer, or hot plate can also be used to heat the edges.

Using a heat gun, hair dryer, or hot plate will make the metal frame rather hot to the touch, so handle it with care.

Be careful not to overheat the device –the OLED display, battery and other internal parts can be damaged by excessive heat. Approximately one minute should be enough to soften the adhesive.