For the record:
I spent HOURS with two Formentors side by side, one with Purple and one without.
I did full extracts of
coding of both cars with
OBDeleven and did a diff compare of the files.
Even with the exact same values on both cars I could not get purple.
There is another module involved and it has also an older software version.
That module contains a look up table providing the colours to be displayed - all that our configs do is choose which position of the look up table to fetch a color from.
Since Purple is not a configurable version in the look up table for older cars, forget about doing it.
Technically it would be possible if you have access to the software to either update the involved modules or just write the newer dataset to old modules, but this is something that CANNOT be done with
OBDeleven or VCDS.
Let's please stop asking.