Awesome contribution Adrian E! That will help many users who are struggling with the correct procedure! You make it very easy to understand as you demonstrated also with the pictures. Great job!
I have one more thing in my mind - there are various statements regarding the firmware update(s). Some claims that is not really necessary to update every firmware one after another, as it can be updated directly to K0257. From your guide I get the opposite perspective. What is really the truth?
Also, how long usually firmware update takes? If for example one FW update takes approx. 1h and I need to go all the way from 0031 to K0257 + map update, I'll need a full tank and 8 hours of hard labour..not mentioned 2-3 sweat T- shirts, knowing something may go wrong