Xperia U already received Android 4.4 KitKat through CM11 custom ROM. You can read a guide on it here: Android 4.4 KitKat For Xperia U With CM11–How To. If you tried this CM11 unofficial build then you already learned that, it not comes with many customization since it’s very early build. Hence, we going to introduce Android 4.4 KitKat based Makay ROM which feature many customization that you going to like including long press back key to kill app, customizable Power Menu and lockscreen shortcuts. This is not an official build either but a fan made Port but work very smoothly. This ROM still have few not working features which we listed below. To learn how to flash this ROM, continue reading this guide to know how to install Android 4.4 KitKat based Makay custom ROM on Xperia U.
Some of the cool Android 4.4 KitKat features that you will enjoy is Screen Recording, Tap to Pay (Google Wallet for everyone), NFC emulation for non nfc devices, 14% less memory usage, cloud printing from Gallery, Google Home is the new Launcher, Core System Processes Trimmed, apps are efficient and responsive on all devices, the all new 'procstats tool details' memory use, Full-screen Immersive mode, seamless change in resolution during media playback, Phone dialer got local business detection, redesigned Quickoffice and many more.
As said already, this is a test build and you should expect some bugs in it. All bugs and issues expected to be fixed as development progress towards a better build.
This tutorial is only for Xperia U. Don’t try this guide on any other Android device. Also, we are not responsible for any damage caused due to the instruction given in this page. Try this at your own risk. However, it is very unlikely that your device will be damaged if you follow all the instructions as it is which are mentioned in procedure.
1. Backup your device data. You can follow our ultimate backup guide.
2. Make sure your device have at least 60% battery power. You can install an app like Battery Notifier BT Free on your Android device to check it easily.
3. You already have USB Driver Installed for Xperia U in your PC. [Download USB Drivers]
4. Make sure USB Debugging is enabled otherwise you won’t able to transfer file between PC and Xperia U. [Guide].
5. Your device have latest ClockworkMod Recovery Installed. [Guide]
6. This ROM is only for Unlocked Bootloader.
If you done everything that we mentioned above then you are ready to follow step-by-step guide on how to install Android 4.4 KitKat based Makay ROM on Xperia U.
File Required(Download by clicking on it)
Congrats! Android 4.4 KitKat firmware based custom ROM Makay is now installed and running on your Xperia U. [source]