Update Sony Xperia Z Ultra C6833 To Android 4.4.4 KitKat 14.4.A.0.108 Firmware

Xperia Z Ultra’s has been updated to Android 4.4.4 KitKat and the  latest firmware is based on the build number 14.4.A.0.108. The new update fixes some bugs, enhances performance, camera has been improved and there are some other minor improvements packed inside Google’s few days old Android 4.4.4 KitKat, that Sony picked up quite soon. As always, the update is on a slow roll out, and will be received using Sony PC Companion or through OTA on your device, but just in case you couldn’t receive this latest update for your Sony Xperia Z Ultra C6833, we’ve a little solution here for you.

In the following post we are going to update Sony Xperia Z Ultra C6833 to Android 4.4.4 KitKat based on the build number 14.4.A.0.108 firmware using Sony Flashtool. The method is manual, and requires to be done being aware, so make sure that you follow this guide carefully in order to get your device this latest firmware successfully.xperia-z-ultra

Early Preparations:

      1. As mentioned, this firmware is only for Xperia Z Ultra C6833. Do not try this on any other phone, that may result in bricking your device. Check your device’s model number in Settings > About device.
      2. You must have installed Sony Flashtool. Find the full guide here.
      3. After installing Sony Flashtool, open the Flashtool folder from the drive where you installed it.
      4. Now open Flashtool>Drivers>Flashtool-drivers.exe and install the Flashtool, Fastboot & Xperia Z Ultra drivers from the list. [Important]
      5. Your phone must be charged at least over 60%. This is highly recommended in order to prevent any power issues during the flashing process.
      6. Enable USB debugging mode on your device. To do so, tap settings>developer options>USB debugging. If you can’t find developer options in settings, then tap settings > about device and tap “Build Number” for 7 times and you’ll get em’ activated under settings.
      7. Make sure that you back up all your important media content,  contacts, call logs and text messages. This is highly recommended and important in case something goes wrong during the flashing process or in case you select the data wipe option before flashing. You can easily restore whenever you need.
      8. To flash this firmware, you do not need to root your device, you do not need to unlock the bootloader. All you need is, your device must be the one mentioned and must be running on Android 4.2.2 or 4.3 Jelly Bean.
      9. Download the firmware file properly.
      10. Use the OEM data cable to connect your phone to your PC. Using any other data cable might cause connection problems.
      11. This firmware can be flashed on Xperia Z Ultra in any region/any country.
      12. Alright! Follow this guide to the letter in order to prevent any mishap.

Here’s how you can update your Xperia Z Ultra C6833 to official 14.4.A.0.108 Android 4.4.4 KitKat firmware:

      1. Before moving forward, please make sure that you’ve read the pre requisites and ensure that you are set to go ahead.
      2. Download the latest firmware Android 4.4.4 KitKat 14.4.A.0.108 FTF file. [Generic]
      3. Copy the file and paste in Flashtool>Firmwares folder.
      4. Open Flashtool.exe now.
      5. Hit the small lightening button on the top left corner and select Flashmode.
      6. Select the FTF firmware file that you placed in the Firmware folder.
      7. From the right side, select what do you want to wipe. Data, cache and apps log, all wipes are recommended, perhaps you may select if you don’t want.
      8. Click on OK, and it will start preparing the firmware for flashing. This may take a little while to load.
      9. As soon as the firmware is loaded, it will prompt you to attach the phone by turning it off and keeping the back key press.
      10. For Xperia Z Ultra, Volume Down key will do the job of back key, just turn off your phone, keep the Volume Down key pressed and plug in the data cable.
      11. As soon as the phone is detected in Flashmode, the firmware will start flashing, Do not leave the Volume Down key until the process is complete.
      12. As soon as you see “Flashing ended or Finished Flashing” leave the Volume Down key, plug the cable out and reboot.
      13. That’s All! Congrats! You’ve installed latest Android 4.4.4 kitkat on your Xperia Z Ultra C6833. Enjoy

In case you got any queries or face any problems regarding this guide, please feel free to stop by the comment box below and let us know. We will get back to you as soon as possible. Thanks all!


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  • @disqus_gG8LkiWJ5o:disqus please show me where does it say that you need to unlock bootloader.

    • No you do not need to unlock anywhere and for anything.

    • disqus_gG8LkiWJ5o

      7. Unlock Bootloader

      Use the following guide to unlock the bootloader of your Xperia device before proceeding.

      • @disqus_gG8LkiWJ5o:disqus please take a screenshot of this step from the guide explained above and paste it here.

  • FlipsideFilm922

    Sir, the firmware file no longer exists in the link.

    • @flipsidefilm922:disqus Thank you for letting me know.
      the link has been updated now.

  • momon sandi2

    can i use for c6802?

  • yudis

    Hello, can i use this guide to downgrade my z ultra (c6833) from 5.1.1 to 4.4.4?

    • @disqus_7NI4bWCl9T:disqus yes you can. Best of luck 🙂

  • @a_baw:disqus Flash stock firmware to recover from bootloop.

  • @a_baw:disqus yes, it will work on both locked and unlocked bootloader.

  • Husam Mikati

    hello .. i pressed on the link to download the firmware 14.4.A.0.108 from thiswritten text from the guide ……….. (Download the latest firmware Android 4.4.4 KitKat 14.4.A.0.108 FTF file. [Generic] … but it is realized that the firmware ends with 118 INSTEAD OF 108 ………………………….what to do and thnx

  • Husam Mikati

    hello … i wanted to flash my phone into android 7.0 … but it is needed to make my bootloader unlocked first… so i tried to unlock it when i had finally been in A Pre-Rooted Flashable Firmware For 14.6.A.1.236 FTF…. but the problem is that i cant unlock my bootloader AS BEING IN THIS Firmware … it told me to go back to KITKAT 4.4.4 … but when i was trying to flash it back to KITKAT … it didnt work with FLASHTOOL …….. please helppp :(((

    • @husammikati:disqus Flash any other firmware, like the Lollipop stock firmware on your phone and unlock the bootloader. It’s not necessary to go back to 4.4.4, you can unlock the bootloader on any stock firmware.

      • Husam Mikati

        thnx for the help!!!

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