HTC One M9, M8, Android 5.1 Android 5.1.1 And Android M Lollipop Update Status
The Android M OS is slated for widespread release after it arrives on the Google Nexus 2015 smartphone. It is already confirmed several HTC smartphones will receive Android M, but the company has been slow to roll out the Android 5.1 and Android 5.1.1 Lollipop updates.
Android Pit reported HTC One M9 users on Sprint, AT&T and T-Mobile received the Android 5.1 Lollipop in the last month. The only major U.S. carrier that has not released the firmware update is Verizon.