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Originally Posted by MattG
If i mess something up doing it will disconecting the battery put it back to the original?
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I don't think it will. The updates are hard coded in the head unit. However there might be some sort of "hard reset" option that I'm not aware of. Look at the navigation manual that came with your car and see if such an option exists.
If you do decide to attempt it, be sure to post here and let us know how it goes.