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The BMW software is the operating system for the car (comparing it to a computer like a PC or a MAC) and every once in a while it needs a tweak to make things run better. Just like upgrading your OS on a computer or getting a patch form Microsoft. BMW will install any upgrade for free if they are installing a part that requires programming such as a water pump etc. If there is no such BMW "need" to upgrade the software you can get it done at your own cost. My cost was $135 CDN.
The dinan software for the E89 was written to communicate with the previous rev and when BMW issued the latest rev, the Dinan software would not talk to it so they had to write an update for the newest version.
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Member ZSCCA 2009 Z4 s35i with Dinan Stage II software, Sport and Exec packages, 19" 296 rims , a stubby and mud flaps
'03 Z4 3.0i Sterling Grey (Hers)
'01 Z3 3.0i Sapphire Black, M sport package (Mine)
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