sounds to me like someone has fitted the widescreen head unit and sat nav drive from a BMW - they can be upgraded from the standard MGR units.
If that's the case that would explain why the screen displays BMW when you power it up. If you search for Mk3 or Mk4 sat nav updates you'll find you can update the sat nav disc with a modified "splash screen" (as it's called).
You can also update the splash screen if you search on-line and are tech-savvy enough to be able to do it.
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