Blueworld3, If the disc is TMC enabled, it should work as described, regardless of OS revision, As long as its enabled in the two places and the TMC channel is set, it should work.

I also would not downgrade to v27.1, v28.1 maybe, but v28.1 onwards has to many advantages over v27.1 for it to be worth it, IMHO.

Is the 2004 disc TMC enabled? (I'm not sure it is)
Have you set the TMC channel to Classic?

BTW, The Dealer exchange price is £99, when you buy the upgraded map disc. (£60 for the CD).

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.