As a reminder, the HTC One M9 Android 5.1 Lollipop update adds some new UI enhancements to HTC Sense, is said to once again improve the camera, better battery life, tweak the do-not-disturb settings. It will introduce a temperature setting for the display colors (warm or cold), not to mention improve battery life, fix the Android 5.0 memory leak, and solve a*few other bugs*that have been plaguing users.*
5.1 Lollipop update will also include a fix to the problematic Stagefright issue, along with enabled roaming capabilities for the 4G LTE bands 3 and 7.