You can get an upgraded backup camera image to the nav screen.. the real question is simply how much is that going to cost you... I have a 2011 and my image is good but fwiw I would suggest contacting the guys at Bimmer-Tech.net or similar BMW aftermarket that specialize in technology upgrades...
I'm surprised its not as simple as upgrading the rear camera itself but even if its not I'm sure you can swap out whaever components are needed to add either the upgraded (2010 & up) camera or third party camera upgrade..
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