In my opinion it seems like most of the VIVO X20 "community strenght", if there is any, lives on the "Chinese Internet", unfortunately among spam, malware and people trying to make a buck or two selling spare-parts or "being able to offer the best possible price".
Since I am new to XDA I haven't yet found my way around however VIVO is popular, or even have a user-group to talk about here on XDA. I saw a few posts, but I would love to get in touch with more VIVO users.
My handset is bought in China (I have a VIVO X20 and a VIVO X20 Plus) please feel free to ask me any questions. As I mentioned in a few other threads the thing that breaks my heart is that there is yet no available solution to root the X20/X20+. I wish the community will come together, and that we can make shared efforts to get a root solution possible. It seems like the "Chinese community" failed this time.