Update Sprint Samsung Galaxy S3 to Android 4.4.2 via Carbon KitKat Nightly ROM

Flash Carbon KitKat ROM Jelly Bean 4.3 for Samsung Galaxy S3 S4

Sprint Galaxy S3 can be updated to KitKat via Carbon Android 4.4.2 ROM. Use this post and you will learn how to successfully complete the guide in no time without bricking its firmware.

This is a custom ROM that will offer you the chance to test KitKat on your phone without worrying about any bloatware files. Carbon KitKat ROM is based on Android 4.4.2 AOSP along with its own features that should improve your Android experience. Also, it features elements from ParanoidAndroid, AOKP and CyanogenMod. If you want to learn more about these builds then you can visit the developing team’s web page here.

Before starting the installation of this new ROM you should first take a look at the guidelines below:

  • Use this post only with the Samsung Galaxy S3 Sprint model.
    - don’t attempt to update any other devices with the files that you will find in this post.
  • This is a guide that will work only with the rooted Galaxy S3,
  • Your phone should run the latest build of CWM Recovery.
    - TWRP Recovery might also work with this post, but you need to make sure that it is update to its latest version.|
    - for this guide I used the CWM Recovery version, if you have TWRP installed you should make sure to apply the corresponding options.
  • The guide contains a step that teaches you how to successfully create a NANDROID ROM Backup for the installed OS.
    - it will create a complete restore point, one that you can use in case the new ROM doesn’t boot in normal mode.
    > this is a step that is listed in the tutorial, so you won’t manage to skip.
  • Factory Reset is needed for the new ROM to install correctly.
    - this factory reset process wipes all data from system partition.
    - data that is stored on internal and external sdcards will not be deleted in the process.
    > this step is listed in the guide, so you won’t skip it.
  • If you want to backup data from installed apps, then you can use the Helium for Android -> here.
    - this application can be used to save SMS text messages and for other important tasks.
  • Sync Contacts info and People details with the default Gmail account that you’ve assigned for your device.
  • Enable USB Debugging from Developer Options menu.
  • Check the phone’s battery charge level and make sure that it is over 50%, so that the phone won’t switch off while you’re flashing the Carbon Android 4.4.2 Nightly ROM.
  • This guide is for advanced users, we cannot be blame din case you brick the phone or lose any important data in the process.
  • If you cannot complete the guide, then you can ask for extra help in comments and we will try to come up with a solution for you problems.

Since you’ve read all of the above, continue to the next part of this post and learn how to update your device.

How to flash Carbon KitKat Nightly ROM for Sprint Galaxy S3:

  1. Download the latest build of this custom ROM from here.
    - make sure to get the very last version and not some older build.
  2. Download Gapps for this KitKat Custom ROM from here.
  3. Use the USB Data Cable and connect your Sprint Galaxy S3 to your computer. Move both zip files to your phone’s internal storage.
    - after the files are copied with success you can disconnect the device from PC.
    > do not unzip the archives.
  4. Power off your Galaxy S3 now completely.
  5. Boot the phone in Custom Recovery Mode.
    - info here on how to boot Recovery in case you don’t know how to do it manually.
    > remember that this guide works with both CWM and TWRP Recovery.
  6. First thing that you have to do is to create a full NANDROID Backup for the installed ROM:
    - CWM: select ‘backup and restore’, name the file and confirm process.
    - TWRP: Press Backup, set a name for the file. Swipe to confirm backup.
    > do not skip this step.
  7. Next, apply the Factory Reset for your phone:
    - CWM: select ‘wipe data/ factory reset’, confirm the process.
    - TWRP: press Wipe, then swipe to confirm that you wish to factory reset the phone.
    > don’t skip this step.
  8. Now you can flash the new Carbon Android 4.4.2 Nightly ROM on your Sprint Galaxy S3:
    - CWM: select ‘install zip from sdcard’, then ‘choose zip from sdcard’.
    - TWRP: press Install.
    > browse your device’s internal storage and load the custom ROM to your phone’s Custom Recovery screen.
  9. When you’re ready you simply need to confirm that you wish to install a new ROM for your device.
    - wait until the process is complete and then continue to the next step.
  10. Use the instructions under step 8 and install the Gapps zip as well.
  11. When all files are installed you can return to the main custom Recovery screen.
  12. Reboot your smartphone now in normal mode.
    > note that the first boot process of Carbon KK Nightly takes several minutes to load, which is why you should wait until the boot is complete.
  13. Use your Google Account info and take control over your smartphone once again. Start testing all the new features and see if your device works better than it did before.

NOTE: If the first boot process of Cabron Kitkat Nightly takes more than ten minutes and it doesn’t boot or, the phone enters into a boot loop, then you will be forced to repeat the entire tutorial once again.

If you do decide to repeat the guide, then it would be best for you not to skip any steps and, besides applying the ‘factory reset’ step, it would be best for you to apply the ‘format /system’ option. This will ensure that no files from the previous ROM are present on your phone, allowing to perform a clean installation of this new ROM.

In case you don’t like how the Carbon Android 4.4.2 KK Nightly works with your Sprint Galaxy S3, then you can always use the file created in step 6 and restore the phone to its previous operating system. If you have any other questions, then you can use the comments field in order to ask for help.