HTC has begun rolling out Android 4.4 KitKat for the One Max with Sense 6 UI on top. The update is now rolling out in Malaysia but its expected to roll out to other regions as well. The update is 560 MB in size and we would recommend downloading it over WiFi. It carries the build number 3.14.707.3.
Updated apps include BlinkFeed with Offline reading support, new Camera and Gallery apps. There are some improvements in the power management department as well, meaning you can expect your HTC One Max to last a little while longer on a single charge.