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.
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