To reset the Forerunner 405:
1.) Press and hold both the Start/Stop and Lap/Reset buttons (the silver buttons on the right side of the device)
2.) Keep holding the buttons for about 6 seconds until the screen goes blank.
3.) Release the Start/Stop button (top button) and keep holding the Lap/Reset button for about 3 more seconds, then release it.
4). Select "Yes" (Enter button) when asked to erase user data.
5.) This will erase all user data and you will need to enter your settings again.
Make sure you do not touch the watch's touch-sensitive bezel during the reset.
