Update Xperia Z C6602, C6603 to 4.4.4 KitKat 10.5.1.A.0.292 Firmware ftf

Sony has started seeding a new update for Xperia Z with build number 10.5.1.A.0.292. The new build number suggests that there are not so many changed included in this build. The new update contains bug fixes and security fixes most probably. This update is available in selected regions at the moment. If your device is suffering from some unexpected bugs then you should update Xperia Z to 10.5.1.A.0.292 firmware. It will fix the bugs found in it and make sure that you get the smoothly running device once again. This update is available for both C6602 and C6603 models.

This guide takes you through the steps involved in doing a fresh install on Xperia Z. The fresh install helps to restore the device, remove any lagginess and fix all the bugs. Updating over previous firmwares is not always the best option. This guide also contains the steps required to keep all the data and application on the device safe. This is the 10.5.1.A.0.292 update for Xperia Z C6602 and C6603. Follow the steps given below to install it on your device.

Xperia Z 4.4.4 KitKat Firmware Details

Supported Devices: C6602, C6603

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Build Number: 10.5.1.A.0.292

Android Version: 4.4.4 KitKat

Basic Requirements for Updating

  • Xperia Z C6602 or C6603 model only
  • Locked or Unlocked Bootloader
  • Updating will wipe root access. Phone must be rooted again


1. ADB and Fastboot Drivers:

ADB is basic tool for any Android related operation and fastboot is one of its applications. ADB installs all the necessary ADB drivers for Android powered devices and activate the developer mode on device. Various tools require ADB and other components to be installed on the PC for proper functioning. Fastboot is used to issue various commands like for flashing a recovery or a kernel. It is also used in commands related to bootloader unlocking. You can use any of the two tools listed below for ADB and Fastboot commands. First one is a full custom guide, and requires heavy installation while Minimal ADB and Fastboot Installer require a mere ~2MB install. However, the first one is more stable and long-lasting. Choose the one suitable for you.

How to Install ADB and Fastboot Drivers – TechGlen

Minimal ADB and Fastboot Installer – Download

2.Sony Xperia Z USB Drivers:

Sometimes, you might get the error, waiting for device or similar errors while issuing commands or using any tool. This is mainly due to faulty connection. If you have properly connected your phone with your pC, via a healthy cable and phone is being charged but not being recognized, then the problem is USB drivers. When a phone is connected, PC searched for drivers online and also on PC. You can install USB drivers beforehand and when you’ll connect PC with phone, it will install all the USB drivers automatically. Download Flashtool from the following page, install it, navigate to its installation folder and locate the drivers folder. Install drivers specific for Xperia Z, including fastboot and flashmode drivers. Make sure that PC installs all these drivers when you connect it.

Sony Xperia Z USB Drivers – Download Here

3.Battery must be charged over 50%:

This is one pf the most important precautions and requirements. You must be aware of the fact that most OTA updates can be installed only if battery is charged more than 50%. This is for the safety of device. The device must not turn off during the whole process. Since these are custom methods, phone may enter a bootloop or may plunge into some other problem. Low battery can be a critical issue in these cases. Therefore, you must charge your phone above 50%.

4.Check your Phone Model:

Many times I have seen people bricking their devices because of their negligence. Note that there are several model numbers, with prominent changes for almost every device out there. Therefore, you must confirm that the given guide is for your device’s model number. As an additional precaution, you must also check that the guide is for your phone’s Android version. This is not necessary in all cases. You can check model number and Android version by navigating to Settings > About Phone.

5.Do not turn off Computer during Updating Process:

If either your phone or PC goes down in the mid of process, you might end up bricking up your precious device. Therefore, make sure that your PC will not turn off or restart during the process. If you are using Windows, make sure that there are no pending updates to be installed in, for example ten minutes. PC will restart automatically, disturbing everything. Therefore, make sure that your PC will remain turned on during the whole process.

Also note that devices are not bricked in every case. It is very rare indeed. however, we must always choose the safe path.

6.Backup all your important Data:

Most custom methods will wipe all data stored on the device. Some methods might not do so but a custom method can make your phone end up in a bootloop and then a factory reset will be essential. Therefore, always make a backup of your device before anything custom. Here is a guide for non-rooted phones, which guides your through all steps to back up a non-rooted device.


You must backup all media files stored in internal storage. As a safe precaution, you might remove SD Card while doing it, however it has never caused anyone any kind of issue. All deleted applications can be installed from Play Store My Apps tab.

If your device is rooted then you have better options for making a backup of your device. You can backup each and every settings along with all applications and all system files along with it. It is pretty useful for restoring your phone to previous state without much hustle. Here is the recommended guide for rooted users.


6.Use correct commands for your smartphone:

You must pay close attention to all the commands described here. You must follow them closely in order to avoid anything unplanned and unpleasant, for that matter. Therefore, always confirm before executing a command.

7.Enable USB Debugging:

Developer Options are, as the name indicates, for development purposes. They are available in all Android devices. The most used and talked about option is USB Debugging. It allows your phone to be handled by PC. You can execute direct commands to your phone via PC. Here is the list of ADB commands, which can be used with USB Debugging enabled. You can also recover data using ADB commands. Here is complete guide.

To enable USB Debugging, navigate to Settings > Developer Options and enable USB Debugging. Note that in Android 4.2.x and higher, developers options are hidden by default. To unlock these, navigate to Settings > About Phone and locate the build number. Tap is 7 times and you will see a pop up message saying “You are now a developer”.


Remember that all processes like rooting, flashing and manual updating are custom methods. They have no concern with Google or mobile manufacturer. Follow every step carefully to avoid any mishap. Owner of site will not be held responsible in case of any mishap. Do it at your own risk. Rooting and flashing custom ROMs will also void warranty.

Required Downloads

How to Update Xperia Z to 10.5.1.A.0.292 4.4.4 KitKat

  • After installing flashtool and downloading firmware, copy downloaded .ftf file into (C:Flashtool/firmwares) folder
  • Now start flashtool as an administrator
  • Click on lightning icon on top left corner of flashtool
  • Now click on “Flashmode”
  • Be careful to choose the right firmware for your device, if you have other firmwares stored too
  • Now click on “Flash”
  • After clicking on “Flash”, wait for a new screen to appear
  • Turn off your device
  • Hold the “VOLUME DOWN” button while connecting your device via usb cable to PC
  • Flashtool will detect it automatically and start flashing
  • Do not leave the button until flashing is completed
  • Hold  button in good position because it will take up to 4 minutes
  • If you leave button in mid, flashing might stop and soft-brick your device
  • You do not need to worry as it is not something serious. You can again flash firmware e asily
  • Do not unplug the device during flashing
  • Do not unplug until Flashing is 100% completed
  • When it is done, unplug the device and power it on
  • First boot may take longer than usual
  • Now navigate to Settings > About Phone and check you android version
  • That’s all! Enjoy

Got any question? Ask me in the comments below

Next: Root Xperia Z C6602, C6603 10.5.1.A.0.292 4.4.4 KitKat and Install CWM/TWRP

Apps for PC +Hayder Ameen is a Computer Science student and Android is his passion. Other than that, he is a gym addict and a great sportsman. Connect with Hayder on Facebook and Twitter Email: Hayder@TechGlen.com Site: WhatsApp For PC

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