How to Update Xperia Z Ultra to Android 4.4.4 Kitkat firmware VIA CM 11 ROM

Xperia Z has recently received the Android 4.4.4 Kitkat update and the update is rolled out via OTA, if you are facing problems then you can manually update Xperia Z Ultra to Android 4.4.4 Kitkat firmware from here. We are not going to talk about Stock Android 4.4.4 here in this guide, as we have brought CM 11 Custom ROM to update Xperia Z Ultra to Android 4.4.4 Kitkat firmware.

Update Xperia Z Ultra to Android 4.4.4 Kitkat Update Xperia Z Ultra C6802, C6806 to Android 4.4.2 Kitkat

Why the advance users depend on Custom ROM’s:

Stock ROM’s are the ROM’s which come pre-installed on the devices and they are developed by the device’s manufacturers. They contain lots of Bloatware and eats most of the batter life. Sometimes they can’t even handle the games and apps and force close them. So most of the advance users go for Custom ROM’s which were always updated to latest Android release and contains less bloatware and run smoothly, fast and provides better battery life. So we have brought CM 11 ROM for Xperia Z Ultra.

CM 11 ROM for Xperia Z Ultra is based on Android 4.4.4 Kitkat firmware and its is fast, smooth and gives you pure Android 4.4.4 Kitkat experience along with some mods and customization, it has its own theme engine. The ROM is quite stable and gives you better battery life as it contains less bloatware. If you are looking for Custom ROM for Xperia Z Ultra, then this ROM might fit your needs. So let’s proceed further and update Xperia Z Ultra to Android 4.4.4 Kitkat firmware.


  • Take backup of all imported data before starting the procedure.
  • Make sure your device is charged to at least 75% or more.
  • USB Debugging Mode should be enabled on your smartphone.
  • Unlock Bootloader on your device from here.
  • Make sure to Install USB drivers suitable for your PC.
  • Setup ADB and Fastboot drivers on PC.
  • Device should have root access.

Disclaimer: Rooting an Android device and installing Custom ROM’s voids the device’s warranty, so we should not be held liable or responsible in any manner for any damage occurred to your Xperia Z Ultra. So, understand the risks involved and proceed further at your own risk.

How to update Xperia Z Ultra to Android 4.4.4 Kitkat using CM 11 ROM:

#1: Download the CM 11 ROM package and Google Apps Package from here to your PC.

#2: Transfer both the packages to the root of your device’s SD card. Make sure to copy at the root of your SD card not inside any folder.

#3: Now switch off your  Xperia Z Ultra.

#4: Enter into Recovery Mode. To do so, press the power button, now while your device boots up and you see the Sony Logo, press the Volume Up button to enter into Recovery Mode.

#5: Once you are in Recovery Mode, perform operations to clear cache, dalvik cache and data.

#6: Now select “Install zip from SD card” and choose the ROM package, which you have copied earlier and install it.

#7: Again follow the above step, but this time choose the Google Apps Package and Install it.

#8: Again repeat the same process of deleting data and clearing  cache and dalvik cache.

#9: Now go back to main menu of recovery mode and select Reboot system now.

Once the device boots up, enjoy the features of Android 4.4.4 KitKat OS.