Just a few random searches.
how do i get a song from play music to music on htc
You pretty much don’t. As least not in any simple way that I know of right now.
clear partition cache m7
Have written about this several times, you have a guide about it HERE.
howto enable on body lock htc one m7
Have written about that HERE.
htc one update no face recognition
Yes, it’s there but under a new place and under a new name (trusted face). You have more info about it HERE.