Well, made a backup of hmi config today before setting my users account.
Think it was a good idea but also think I should have maybe backed up the entire car.
Once I've set up my user account, I lost the purple color and back to the old ones.
I'll give me a day or two to analyze what changed before/after but here's a thing interesting;
Color bitmask settings directly out of the
garage was: 7FFFFFFF and after setting the user: 3FF
Knowing that on the octavia 7FFFFFFF is the key to the purple color, it's seems to me it's perfectly logical that it was needed to have the purple color out of the
garage on my leon.
Anyway, I'll post the back up before/after probably monday if I can't make a breakthrough.
Would be cool if I could find the solution and share it with the community