For me, it was an OS update. Connected to WiFi, and it downloaded and installed.
Sent from my HTC One_M8 using AC Forums mobile app
Sent from my HTC One_M8 using AC Forums mobile app
Its been sitting in my notification area all morning and I cant swipe it out.
I'm not sure what triggered it on mine but going through the apps running and stopping 'HtcDm' service made it go away for me