The retrofit with the 4B module is very difficult is my experience. Better to work with the 55 xenon range module. I have retrofit this a lot. Use the 7P6 907 357 E with tiguan file. Make coding in adaptions in 09 and basic settings in 55. Finish.
May you explain how to use 55 with LED? pinout for 55 so that 29 39 D6 D7 will work?