I would like to buy a preowned 2009 map cd if anyone has one for sale half price ? thx !

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You can't use it... It has a unique ID that must be entered at Pioneer's website with YOUR serial number. It generates an install code for your unit only. You need to buy the pioneer update disc, upgrade your exisiting drive (instructions in the sticky posts on the forum), or buy a preconfigured upgraded hdd. Don't let anyone sucker you into buying an update disc that has already been used.

oh, ok, didnt know, will contact regarding hd upgrade, thx !