After a lot of teasing, Team Substratum and XDA-Developers are proud to announce the release of the Andromeda add-on for Substratum which brings full custom theme support for any Android 8.0 Oreo device without root. We realize that many people are excited by this project, but there are many people who feel that this news has been overwhelming for them in the amount of technical details we’ve been relaying. For those people, we want to reassure you that the end product is simple enough to use for your average user, and that it does not require you to understand how to use complex scripts or ADB commands. This tutorial is aimed at showing you how to set up and install the new rootless Substratum, and then use the theme engine to install custom themes.
Now, I am not going to copy-paste the guide from XDA-Developers site, since it might get updated very often, instead I will add a button below linking you to the actual guide there. That said, video on top shows the idea and overall how-to thanks to my Fellow Lebanese TK-Bay 😉