RGMaster, I have 2 cars and the first one is Audi A6 2010. As it a Linux system and not so many tools for backup, not options for recovery, etc, I oscillate to do or not do update alone. I read about many guys who brick their units trying updating.
But finally I have got courage, seeing that the packages are tested and working, and I have done it alone. This is second update on my car and was going well.
Second car as you know is a Dacia Duster 2017, where the navigation system is more open and when you see what you do, you are more confident and catch me more.
Keep doing like that.
I answer you by email not having other way at your question.