LED rear lights dashboard warning

[colinrob]

I have just fitted LED rear ligts to my Jna 03 M3 and I am getting warning lights on my dashboard that the brake lights arent working but they do anyone on here got sny ideas

[Schermerhorn]

You need to get them 'flashed' so they can work properly on your car.

[colinrob]

How do you do that?