HTC has officially started rolling out the much-anticipated Android 4.4.2 update to all its factory unlocked and Developer Edition models of its flagship smartphone, the HTC One, currently located in the United States. In addition to the hefty bump up from Jelly Bean to KitKat, this particular upgrade brings a newer version of the Sense 5.5 user interface, as well as a multitude of bug fixes, speed optimizations and stability improvements.

The One was released back in March 2013, and packs a 4.7-inch Super LCD3 capacitive touchscreen with a 1080 x 1920 resolution, a 1.7GHz quad-core Qualcomm Snapdragon 600 processor, an Adreno 320 GPU, 2GB of RAM, 32/64GB of internal storage, a 4-megapixel UltraPixel rear-facing camera and a 2,300 mAh battery.

The full changelog for the Android 4.4.2 KitKat update, which weighs in at a whopping 312MB, can be seen below:

• Android 4.4, KitKat: Android 4.4.2, KitKat, is the latest release of the Android platform. KitKat includes enhancements such as restyled status and navigation bars, a new full-screen mode, color emoji support, improved closed captioning support, stronger security, smarter power use, and more tools and capabilities for better app development.
• Phone dialer: Improved the phone app with the ability to look up contacts directly from the dial pad, see and tap frequent contacts, and search your corporate directory easily.
• Camera – Focus and exposure: Enhanced the “touch to focus” option with a new circular, on screen control that can be dragged by your finger around the viewfinder to adjust a photo’s focus and exposure.
• Gallery – Photo editing: Added new photo editing options to the Gallery app including new filter effects, draw on your photos, advanced cropping, and adjustments to color, exposure, contrast and more. A completely redesigned user interface.
• Printing documents and pictures: Added support for printing photos, Google Docs, GMail messages, and other content via Wi-Fi, Bluetooth and hosted services like Google Cloud Print and HP ePrinters.
• Hangouts – SMS/MMS support: Incorporated a new version of Google Hangouts that supports integrated SMS/MMS messaging. Hangouts can be set as the default SMS app under Settings > Wireless > Default SMS app.
• Accessory: support Added support for Square credit card reader.

If you own either a Developer Edition or unlocked model of the HTC One and have not yet received the OTA update, you can head into “Settings,” then “About Device,” and select “Check for Updates” to manually scan for this upgrade. Alternatively, you can wait until you receive a push notification, promoting you to download and install the update.

• ViaAndroid Central