Against the KJK JDL201:

Switch the power from OFF to SETUP at first.
Then press “MENU” button and "PLAY" button at the same time (Don't let go of your fingers) and turn power switch to "SETUP". Password will be cleared automatically when the camera starts.

Against the KJK LK27, LK226：

Switch the power from OFF to SETUP at first.
Then press “MENU” button and "REPLAY" button at the same time (Don't let go of your fingers) and turn power switch to "SETUP". Password will be cleared automatically when the camera starts.

Against the KJK228：

Switch the power from OFF to SETUP at first.
Then press “⇧” button and "OK" button at the same time (Don't let go of your fingers) and turn power switch to "SETUP". Password will be cleared automatically when the camera starts.