Today,
Lenovo Z5s pushed an update, ZUI 11 development version, which comes with a couple of features. The new ZUI 11.1.058 development version is based on Android 9 Pie and it comes with the April 2019 Android security patch. It brings a lot of updates, including classic U-Touch regression and support for Unicom VoLTE.
The following is the ZUI 11.1.058 development version update log: