Vivo recently launched a new phone as the S1 Pro in the Philippines. Unlike the device sold under this name in China, it has the Snapdragon 665 processor and quad rear cameras. The newer version is also now rumored to be released to the Indian market soon.
https://www.notebookcheck.net/Vivo-is-to-release-a-new-kind-of-S1-Pro-in-India-soon.443879.0.html