Today, I completed the IMMO OFF for AL551. Then, I searched for "AL551 IMMO OFF" just to see if it was in demand and came across this post.
@projectLSaudiA4, you were close, but not quite right.
There are a few patches that need to be applied to remove the gearbox protection message. However, after 4–5 hours of work, it’s done—no DTCs, no dashboard errors, and a fully functional transmission without any IMMO adaptation.
Great work Neuro. This is my first go at any reverse engineering which maybe wasn't the best place to start.