Please use the following instructions to reset your GoPro to its factory settings.
This will not affect connected storage devices such as an SD card.
1) Press the Mode (front) button until you see the 'Setup' gear icon.
2) Press the Shutter (top) button to select it.
3) Press the Mode (front) button until 'Rest Cam' is highlighted and use the Shutter (top) button to select it.
4) Press the Mode (front) button to highlight 'Reset'.
5) Press the Shutter (top) button to select it.
6) When the camera powers on, it will be set to all of the factory defaults.