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Originally Posted by davipt
Ah so the update dvd is only for the non-idrive cars.
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Almost. The OS update disks work in the non iDrive cars, plus it also works in the E65/E66 iDrive cars (only). It does not work in any of the other iDrive cars.
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Originally Posted by davipt
Any known issue when updating a E46 from v24 to v27 or v28?
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I assume the E46 as a MKIV computer? If so, there are no risks really, just benefits. Sometimes, an upgrade can kick the navigation computer into "Euro" mode, which means that the "Emergency" menu option goes away, the Accept screen is disabled, short distances are in yards instead of feet, and you gain the Route Magnet option. The reason I do not call Euro mode a risk, is because that is actually the preferred setup for almost everyone who has a nav system.