Redmi released a ~US$160 5.99-inch device with the Snapdragon 625 SoC and dual rear cameras in 2018. It is known as the S2 in China and as the Y2 in India. Of these, the S2 has started to exhibit an update to Android 9.0 (Pie).
https://www.notebookcheck.net/The-Redmi-S2-aka-Y2-gets-its-Android-Pie-update.423706.0.html