Disconnect the 4 wire plug, this is crashing the ULF by the sound of it, maybe the cradle has a fault (and thats why is was disconnected).

If you have navcoder or an intravee (ipod interface) then you can initiate a BT pair with either of these.

You may be able to force a pair with the pair and gnd from the pair plug, but I'd need to know the wire colours.

The BT and nav systems work independently, the phone is displayed on screen like the nav, tv, radio and cd.

Updating the nav will have no barring on the phone, tv, cd changer, radio etc....

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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.