When you open the theme in the Substrate application, the drop-down menu appears at the top of the layers. You must choose one based on your Android ROM version. There are also overlays with different variants for a specific Android version.
When you install overlays for the first time, after you build and activate, you must restart and then enable overlays. To update an overlay, you must first disable it, then create and activate, it is not necessary to reboot again, except for the superposition of the Android system.
Supported Android
{7.0 and UP}
Supported Android Version:-
Nougat (7.0 – 7.1.1) – Oreo (8.0-8.1)
Download nineteen substratum onehundred Patched APK For Android