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Flash the CM 12.1 Android 5.1.1 Stable Release for Sony Xperia Z

The CyanogenMod 12.1 Stable builds are now live for all the Sony Xperia Z smartphones. Check the instructions that we have listed in this post in order to learn how to successfully install this new custom ROM on your Android device.

The CM 12.1 Stable ROM is based on the latest AOSP Android 5.1.1 Lollipop release. It packs all the Stock Android features as well as tons of other extra things designed by the CyanogenMod team. Check more about this release here and here.

If you want to run a custom Lollipop ROM on your device that’s stable and reliable, then you should check the instructions below to learn how to flash it on your Xperia Z phone. Before starting the update you should read the guidelines below:

  • use this post only with the Sony Xperia Z device.
    – do not use this post with any other default Gmail account.
    – go to Settings> About Phone and make sure that the model number of your phone is C6603.
  • your device has to be on a rooted firmware and it should feature a custom Recovery on it, too.
    – the installed custom Recovery has to be updated to its latest version, so that it supports the latest Android 5.1.1-based custom ROMs.
  • the tutorial part of this post features two extra preparation steps like the NANDROID Backup and the Factory Reset ones.
    – do not skip these steps.
    – the NANDROID Backup creates a complete restore point for your smartphone, one that you can use in case the new ROM doesn’t boot in normal mode.
    – the ‘factory reset’ removes the old ROM from your device and it allows the new ROM to install successfully.
    – without factory resetting the phone, the newly installed custom ROM might not be able to boot in normal mode.
    – the ‘factory reset’ process is going to wipe clean the system memory partition, but it won’t mess with the internal storage of your phone.
  • if you want to save data from installed applications then you should use the Helium tool for Android.
  • read this entire post and do not skip any steps if you want to complete the installation process of this new ROM at your first attempt.
  • use this post only if you are an advanced Android user, we cannot be blamed in case you brick your phone nor in case you lose any important data in the process.

Continue to install new CM 12.1 Stable builds using the CyanogenMod Updates menu under Settings> About Phone section. Since you’ve read all of the above you can continue to the next part of this post.

How to flash the CM 12.1 Stable Android 5.1.1 for Sony Xperia Z C6603:

  1. Download the CM 12.1 SNAPSHOT zip from here.
  2. Download Gapps for Android 5.1.1 ROMs from here.
  3. Transfer both files to your phone’s internal storage.
    – after the files are moved you can disconnect the device from PC.
    – do not unzip the archived files.
  4. Power off your smartphone.
  5. Boot the device in Custom Recovery Mode.
  6. First you will have to create the NANDROID Backup for the ROM that’s already installed:
    – for the TWRP Recovery select the ‘backup’ option.
    – CWM Recovery users should use the ‘backup and restore’ option.
    – set a name for the file and confirm the process.
  7. Factory Reset the smartphone:
    – CWM: select ‘wipe data/ factory reset’.
    – TWRP: open the Wipe options menu.
    – confirm that you want to wipe all the data on the system partition.
  8. Now you can install the CM 12.1 Android 5.1.1 Stable ROM:
    – CWM: select ‘install zip from sdcard’, then ‘choose zip from sdcard’.
    – for TWRP you should select the ‘Install’ menu.
  9. Find the Custom ROM zip file and confirm the installation.
  10. Install the Gapps zip after the new custom ROM files have been installed.
  11. Reboot the Sony Xperia Z in normal after the CM 12.1 ROM and Gapps files are flashed.
    – note that the first boot process of this new ROM is going to take a while before it loads all the new files.
  12. Use your Google account data in order to regain complete control over your device.

These were all the steps that you had to take in order to complete the CM 12.1 flashing process.

If you need more help completing this guide, then you should tell us in comments and we will try to come up with viable solutions.

You can repeat the whole tutorial more than once if the install fails at your first attempt. Make sure that in case you repeat the guide that you won’t be skipping any steps and that your Xperia Z device meets all requirements listed above the tutorial.

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