It gave me an error and it didnt restore the previous wa. Now the program says there is no wa installed.From far as I know, part 3 MUST be STRICKTLY followed.
I my self was unable to succede, so I went back again restoring my previous WhatsApp and syncing with Google Drive, and then did all over again but following it to the letter!!!
It is the only way it would work for sure.
Try looking at what you do and follow it even if some points look strange..
How do I restore the wa installation? The databases are still in the phone but dont know if the key is.