Ensure that your device is turned off.

Remove any micro-SD card that may be installed in the Fire. Failure to do so could damage the micro-SD card itself or the micro-SD card reader on the Fire.

While holding the device firmly, wedge the iFixit Opening Tool into the crease along the outer edge of the device (as shown in the image).

Slowly, grind the iFixit Opening Tool into the crease along the outer edges of the device until the entire back cover loosens.

Then, remove the back cover from the device.