Is there a way to program the official rom of a samsung phone?
for example to add a feature on the rom that doesn't exist or just the only way is to create your own custom rom?
My phone is Samsung Galaxy Note 5 Marshmallow 6.0.1. A feature that I want to add is the ability to mark as read messages from notifications without open them. (I don't want to create an app for this that's why am asking how to program the official rom)