Samsung has stopped updating the Galaxy S6 and S6 Edge since Android 7.0 Nougat and for those of you who want to still get latest Android 8.1 Oreo + root, here’s how to do it. Now, this is NOT a Samsung Touchwiz firmware, rather custom ROM or AOSP(What is AOSP?) But you will get much better performance and battery life over Samsung Touchwiz plus the latest and great Android 8.1 Oreo so I don’t see why not. The NexusOS ROM comes with all the standard features of latest Android 8.1 Oreo and a few additions like Always On Display.
If you are still stuck on older Android OS such as Android 6.0 Marshmallow or even Android 7.1.2 Nougat, you may want to upgrade your OS to the latest Android 8.1 Oreo by using the Lineage OS 15.1 custom ROM for the HTC One M8. This is a full-feature packed custom ROM that will get your aging HTC One M8 to the greatest and latest Android OS. You will get ALL of new Android 8.1 standard features plus couple customization that Lineage OS brings.
In this video I show you how to install the latest and greatest Android 8.0 Oreo on your Google Pixel, Pixel XL, Nexus 6P, or 5X. Google will push out Android 8.0 Oreo update via OTA(over-the-air) eventually but if you are too impatient to wait or you are on a rooted phone with custom ROM, you can manually install it using Google factory images.