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Ksenia, thank you for such useful post. Ksenia previously managed upgrade tasks in our company and she made this post basing on her experience.

Unfortunately, there is no magic sync script which will done all sync job for you. Our upgrade team has some inhouse tools to make their job safer and easier at the same time. But these tools are like very specific science equipment, which need to be used in specific conditions and for only certain stores, but not a magic wand which solve all the problems immediately.

Our upgrade team use the same diff and files from File Area, which are also available and for customers. The only difference that they have 10-years experience with upgrade process. If I cannot score all the 10 three-pointer shots, I will not say that it is impossible, because Michael Jordan can do it.