Now comes the hard part.

Your Kindle may not respond to the power button, and disconnecting the frontlight at this point will leave it in that unusable state.

Tap on or bring a magnet close to the hall effect sensor.

When the frontlight lights up, immediately unplug its connector.

If your Kindle remains awake for more than 3 seconds, you may now put it back to sleep by pressing the power button.

If not, you may have to repeat this step.