Xiaomi's gaming-focused series of phones, Black Shark, run on an Android skin called JoyUI. Today (April 28, 2020), its latest stable version will start to appear as an OTA worldwide. This will occur on the brand's 2020 flagships, the 3 and 3 Pro, as well as their predecessors.
https://www.notebookcheck.net/Black-Shark-rolls-a-new-software-update-out-to-its-latest-models.463159.0.html