3. Remove the main body fixing screws, and remove the main body from the camera mounting bracket. (Fig. 3).
Camera mounting bracket
Main body
Main body mount screw
(Fig.3)
Remove the screws identified by the 
mark(Figs. 4).
(Fig.4)
4.Fix the camera body to ceiling, wall or box with the camera body fixing screws. (Fig.5)
Make sure that it is fixed firmly.
Make sure of the position of the front of the camera.
Camera mounting 
bracket
Front of camera
Camera mounting bracket mount screw
(not attached)
(Fig.5)
6