HTC has begun rolling out Android 4.2.2 Jelly Bean update to both HTC One and HTC Butterfly smartphones amid rumours.

"There were quite a lot of rumours about upcoming HTC Sense and Android 4.2.2 update for HTC One and HTC Butterfly. All were expecting HTC Sense 5.1 to show up, but instead, the version of HTC UI in latest Android 4.2.2 update is still 5.0," wrote AndroidRevolution which got the screenshots of HTC One Android 4.2.2 update.

The possibility of HTC One getting Android 4.2.2 update with Sense 5.1 was rumoured for quite some time. Although the lately leaked details suggest that HTC One will receive many changes with the update, there is no official confirmation of the availability of the Jelly Bean update for the smartphone.

As per the leaked details, HTC One Jelly Bean update still sticks to the Sense 5.0 and a brings a number of additional user interface features. The update is expected to bring changes to the Home button; pressing down on the home button for long will give access to the menu button and Google Now.

There will also be a battery indicator which shows the percentage of the battery. In addition to this, the update will bring Android daydream, Android-native sound profiles or EQS or equalizer controls and changes to the app drawer.