How do I restore my camera(s) to factory default settings?

Assuming the camera has a physical reset button… with the camera connected/powered, depress-hold the reset button for 15 seconds. Do not release the reset button, yet. With the reset button still depressed, remove power from the camera. Do not release the reset button, yet. With the reset button still depressed, wait 15 seconds and then reapply power to the camera. Do not release the reset button, yet. Wait another 15 seconds after camera is powered, NOW you can release the reset button. Camera should be reset to default settings.