Stock FM radio app seems to be missing in my Sprint HTC M8, I found this app and it works great, no root needed...
Sent from my AWESOME HTC ONE M8 ..?
https://www.dropbox.com/s/v1727zwdbalhpwu/FM_Radio.apk
Sent from my AWESOME HTC ONE M8 ..?
https://www.dropbox.com/s/v1727zwdbalhpwu/FM_Radio.apk