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Flash CM 11 M12 KitKat Stable ROM for Sony Xperia T

The CyanogenMod 11 M12 Snapshot ROM is now available for the Sony Xperia T smartphone. Use this tutorial in order to learn how to successfully flash the new custom ROM for your device.

The CM 11 M12 Snapshot ROM is obviously based on Android 4.4.4 KitKat ROM and it is a stable build, much more reliable than the CM 11 Nightlies. It might possibly be one of the final builds based on KitKat that we will see released for the Xperia T, as the CM team is currently working on releasing the CyanogenMod 12 builds based on Android 5.0 Lollipop. Read more here.

Before starting the install process you should read the preparation info below:

  • use this guide only with the Sony Xperia T device.
    – do not attempt to flash the files listed in this post on any other Android device.
  • in order to complete this guide your device has to be rooted and running the latest CWM or TWRP custom Recovery.
    – both CWM and TWRP are working with this post, but you will need to make that these are updated with their latest build.
    – older builds of CWM and TWRP aren’t supporting the Android 4.4.4 custom ROM.
  • in the tutorial part of this post you will find two extra preparation steps: NANDROID Backup and Factory Reset:
    – the NANDROID ROM Backup creates a full restore point for your Xperia T smartphone, it can be used in case the new CM 11 M12 ROM isn’t able to boot in normal mode.
    – the Factory Reset has to be applied in order to remove all the data that was installed by the previous ROM.
    – Factory Reset will not delete any files from the internal storage of your phone, only the system partition is wiped.
    – don’t skip these steps if you want for the CM 11 M12 ROM to boot successfully after the install is complete.
  • if you need to save data from installed apps, then you should use the Helium tool for Android.
    – data from Contacts and People details can be synchronized with your default Gmail account.
  • this is a tutorial that will be used by advanced users only, don’t blame us in case you end up losing any important files in the process.
  • read the whole guide and don’t skip any steps.
    – also, make sure that the device’s battery life is over 50%, this will prevent the device from powering down during installation.

Now that you’ve read all of the above you can continue to the next part of this post.

How to install the CM 11 M12 Snapshot ROM for Sony Xperia T:

  1. Download the CM 11 M12 ROM zip from here.
  2. Download Gapps for Android 4.4.x Custom ROMs here.
  3. Copy both files to your phone’s internal storage.
    – after the files are copied you can disconnect the Xperia T from PC.
    – if you’ve used the phone to download the files automatically, then you can skip this step.
    – do not unzip the files.
  4. Power off the Xperia T and then boot it in Custom Recovery Mode.
  5. First thing that you need to do is to create a full NANDROID ROM Backup:
    – CWM: select ‘backup and restore’.
    – TWRP: press ‘Backup’.
    – set a name for the file and confirm the process.
  6. Apply the Factory Reset:
    – CWM: Select ‘wipe data/ factory reset’.
    – TWRP: press ‘Wipe’.
    – confirm the process.
  7. Now you can begin the installation process of this new ROM:
    – CWM: select ‘install zip from sdcard’, then select the ‘choose zip from sdcard’ option.
    – TWRP: press Install.
  8. Find the CM 11 M12 Snapshot ROM and confirm process.
  9. After the ROM is installed you should flash the Gapps zip, too. Use the same actions as in step 7.
  10. When all the new CyanogenMod 11 M12 Snasphot ROM and Gapps files are flashed you should reboot your Xperia T in normal mode.
    – note that the first boot process of this new ROM will take a while before it loads all the new files.
  11. Use your Google account info or create a brand new CM profile in order to take complete control over your device.

These were the steps that you had to follow in order to complete the installation of a brand new Android 4.4.4 KitKat custom ROM for your Xperia T device.

If the installation fails at the first attempt, then you can try and repeat the whole guide. Make sure not to skip any steps and to apply the ‘factory reset’. Also, you should try to apply the ‘format /system’ option after the ‘factory reset’ action is completed.

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