then disconnect the cable from the vehicle battery negative
2.Remove the metal strap attached to the back of the unit (if present).
3.Press the release button to remove the front panel.
4.Lift the top of the outer trim ring then pull it out to remove it.
5.Insert both of the supplied keys into the slots at the middle left and right sides of the unit then pull the unit out of the dashboard.
2.DIN rear-mount (method B)
If your vehicle is a Nissan or Toyota, follow these mounting instructions: Use the screw holes marked T (Toyota) or N (Nissan) located on both sides of the unit to fasten the unit to the factory radio mounting brackets supplied with your car.
Fasten the unit to the factory radio mounting brackets. Align the screw holes on the bracket with the screw holes on the unit, and then tighten the screws (5x5mm) on each side.
Note: The outer trim ring, sleeve and the metal strap are not used for method B installation.
Using the detachable front panel
Removing the front panel
1.Press the RELEASE 
button to flip down the front panel.
2. Pull off the front panel.
3.Store the front panel in its protective case.
Installing the front panel
To install the front panel, insert it as shown in the drawing below. Be sure it is fully inserted. If not, the display or some of the keys may not function properly.
BV7300 User’s Manual - page 5
