Kogan KGNDVCVDB User Manual page 53

If you select Delete All, a prompt appears on screen for
confirmation. Move the joystick left and right or tap the screen
to select the desired option. Press the center joystick button or
tap the screen to confirm. All files stored in memory will be
deleted.
3. Press the Menu button or tap
Note:
Once deleted, files cannot be recovered so make sure
you have a backup before you delete. Files that have
been protected will not be deleted. You have to
unlock the files first before deleting them.
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to exit the menu.