just to get thing's clear for you, the part number is 61 12 0 440 812, but the cable itself will say 0 440 796, i didn't do anything to modify the unit, or so, that's the way it comes from oem, FROM THE FACTORY... here is another site that back's up my statement...
http://bmwfans.info/parts/catalog/61120440812/
i didn't sell you a fake, or copy, or any type of modified version of what i've said... this is the actual, oem ,BMW, cable, i ain't sure why it ain't working for you, but maybe call your local dealer and ask them the issue you are having...