You need to install the Substratum themed engine app to use this theme, the minimum version required is version 803 The Prime Substratum theme works on Android Oreo 8.0, 8.1 and Android Nougat 7.1. + ROM with WHO and RRO. This theme comes with various Dark background options and also Thematic base for transparent options for Nougat and Oreo. There are many options within the theme from changing the primary, accent and background colors to changing the appearance or layout in some applications.
* Substratum / Substratum Lite theme engine required
* Reinstall Overlay after updating the app
* Disable overlays before updating the system
* Overlaps can cause bootloops and forcefully close the app
Supported Android Devices : [4.0.3–4.0.4] Ice Cream Sandwich - [4.1–4.3.1] Jelly Bean - [4.4–4.4.4] KitKat - [5.0–5.0.2] Lollipop - [6.0 - 6.0.1] Marshmallow - [7.0 – 7.1.1] Nougat - [8.0-8.1] Oreo -  Pie