Swift Black Substrate Theme makes over 200 black applications and supports:
Make sure your system supports the use of a bedrock theme. See above list supported.
Download the theme Substrate engine application and theme. When you open the substratum application you will find the theme inside.
Open the theme in the bedrock app and select your Android version from the menu at the top. Also select the applications you want to install the theme and press.
Download Swift Black Substratum Theme +Oreo Samsung theme 16.6 Patched APK For Android