GoPro HERO 4 Black User Manual page 60

/ Setup Mode
DELETE
This setting lets you delete the last file, or delete all files and format
the memory card. Deleting all files is useful after you transfer your
files to your computer and want to make room on your memory card
for more content. LED lights blink until the operation is complete.
NOTICE: If you select All/Format, the memory card is reformatted,
which deletes every file on the card.
CAMERA RESET
Camera reset returns all settings to their default values. This
option does not reset the Date/Time or your camera's username
and wireless password.
Note: If your camera is not responding but you do not want to lose your settings, press and hold the
Power/Mode button for 8 seconds.
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