fullfatrr.com Wiki > Secret codes 2002 to 2005
 
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Turn ignition to Stage 2 or start the car Press Menu Choose Set and press BM knob to go to Settings Press Menu and Hold until secret menu appears

more info here

http://www.bimmernav.com/Advanced_Programming_and_Secret_Menus_of_the_BMW_Widescreen_Navigation_Display.html


[credit to member Joe90]