Update Sony Xperia Z with Unofficial CM 10.2 Test ROM based on Android 4.3 Jelly Bean Firmware

Update Sony Xperia Z to Android 4.3 using Unofficial CM 10.2 Test Build ROM

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An unofficial build of CyanogenMod 10.2 ROM has been released on XDA for the Sony Xperia Z device. This is a custom ROM based on Android 4.3 and CyanogenMod team’s latest builds. Note that it is not a final release and you might encounter errors and bugs while using it. Also, since it is only a test build you should only install it in case you’re an advanced user.

Read this entire post and you should be able to apply at your first attempt without bricking the Sony Xperia Z smartphone. This build of CM 10.2 doesn’t have any major bugs and all things should work fine for you. Also, the Focal, camera app created by CyanogenMod team, comes pre-installed and it works great. All the latest Android 4.3 AOSP features have been integrated with success. However, note that this is not an official CM team release nor an official Android 4.3 update, but a custom build compiled by an XDA member and developers called xZain69.

In order to be able to flash all the required files at your first attempt you will need to take a look at the preparation guide below first. Make sure to read the info before starting the updating process, as you will learn how to setup the Sony Xperia Z for the installation of CM 10.2 Test ROM. Here’s what you need to know:

  • This guide will work only with the Sony Xperia Z.
  • Do not attempt to install the files you find here on any other different Android device, as you will end up bricking it.
  • Your device has to be factory unlocked, it should be rooted and running a custom Recovery image like the TWRP or CWM.
  • In the tutorial guide you will find a step that will ask you to ‘wipe data and factory reset’ your Xperia Z. This will remove the contents from the device’s system partition which will delete installed apps data, SMS and other similar files.
  • If you want to backup SMS, Call Logs info or APN Internet Settings then you can use this apps: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Root access is required for some of these apps.
  • The contents stored on your phone’s internal SDcard will not be deleted by the ‘factory reset’.
  • Also, make sure to sync your Contacts data with your default Gmail account. This process will backup all saved Contacts info such as phone numbers.
  • The USB Debugging should be enabled in the Developer Options menu.
  • Make sure that the Xperia Z battery has enough power left in it before starting the updating process, as you wouldn’t want for your device to power off while you’re installing the new files. In case the device switches off you will need to repeat the entire tutorial once again.
  • This guide is for skilled Android users who know how to use CWM or TWRP Recovery and how to flash a custom ROM zip. If you don’t know what you’re doing then you should ask for more help in comments.
  • Note that we cannot be blamed in case something goes wrong or you lose any important data files in the process.
  • Do not skip any steps and make sure to read the entire post before starting the update.
  • More info about this custom ROM can be found in this XDA thread here.

These were all the guidelines that you had to go over before starting the update. Now that you’ve gone past all of them you can continue to the next part of this article and learn how to apply an update for your Sony smartphone.

How to flash an Unofficial CM 10.2 Test ROM Build based on Android 4.3 for the Sony Xperia Z:

  1. Download the CM 10.2 unofficial ROM from here.
  2. Download Gapps for this custom ROM from here.
  3. Connect the Xperia Z with your PC via USB data cable. Now move both zip files on your device’s internal SDcard without extracting its contents.
  4. When the files are copied with success, you can disconnect the phone from computer.
  5. Now, power off the smartphone completely.
  6. Boot the Xperia Z into CWM / TWRP Recovery Mode. Both custom Recovery variants will work with this tutorial and you should be able to complete the installation using any of them.
  7. First thing that you need to do in Custom Recovery Mode is to create a full NANDROID Backup of the currently installed ROM. Here’s how to do that:
    > for CWM Recovery select ‘backup and restore’ option. Confirm this process.
    > for TWRP Recovery press Backup. Select the system files you wish to backup and confirm.
  8. After the Backup is complete, return to the main Recovery screen and apply the ‘factory reset':
    > for CWM Recovery select the ‘wipe data/ factory reset’ option. Confirm.
    > for TWRP Recovery press Wipe button, then Factory Reset. Confirm.
  9. Install the custom ROM now:
    > for CWM Recovery select ‘install zip from sdcard’ option, then from the new menu select ‘choose zip from sdcard’. Find the CM 10.2 Unofficial zip file and confirm the installation.
    > For TWRP Recovery press Install. Now browse the internal storage for the CM 10.2 Unofficial zip. Load it into TWRP and confirm that you wish to install it by sliding the blue button at the bottom of the screen.
    – the installation process shouldn’t take more than several minutes to complete.
  10. When the ROM is installed you need to repeat step 9 and install the Gapps zip as well.
  11. After both zip files have been flashed you should return to the main Recovery screen. Reboot the smartphone into normal mode now.
  12. The first boot process of the new ROM shouldn’t take more than five minutes to load all files.
  13. Enter your Google Account details and take control over your smartphone once again.

These were all the steps that you had to take in order to flash all the new CM 10.2 Unofficial Test ROM for your Sony Xperia Z. Make sure to test all the new CM 10.2 and Android 4.3 features and functions. If the installation failed at your first attempt, then you will need to repeat the entire tutorial once again. Don’t skip any steps that I have listed above.

Also, if you find any major bugs or you don’t like this new ROM, then you can restore the Xperia Z to its previous ROM using the NANDROID backup file created in step 7. Use the comments field for any other questions.

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