DXG Technology DXG-587V HD - Manual (Page 66)

If you select Delete All, press the center joystick button to
display the submenu.
3. Move the joystick left and right to select X or √ and then
press the center joystick button to delete.
4. Press the Menu button again to exit the menu.
56
z 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.