I understand, but it's not a replacement of the MK4, it's a modification within the MK4.

If BMW did not put so much intelligence in the DVD unit, it would be much easier. Or take a carputer as you say.

But we need to keep the MK4 functionality, except for the data source we would like to replace the DVD drive for a harddisk or Solid State Drive (SSD) or for a SD Card.