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Flash CM 10.2 Experimental ROM based on Android 4.3 for Sprint Samsung Galaxy Nexus

Experimental builds of CyanogenMod 10.2 ROM for Sprint Galaxy Nexus are now available. Use this tutorial and learn how to successfully update your smartphone without bricking it.

The CM 10.2 Experimental build is the first stage and it should be followed by Nightlies, then Release Candidate builds and finally reaching the Stable phase. All of these CM 10.2 builds will be based on Android 4.3 Jelly Bean. If you want to learn more about the features and things added by CM 10.2, then you should take a look at the developer’s web page.

If you want to flash the new ROM at your first attempt, then you should take a look first at the preparation guide below:

  • Use this post only for the Sprint variant of the Samsung Galaxy Nexus phone.
  • Don’t try to update any other devices using the info that I’ve listed in this post.
  • Your device has to be on an unlocked bootloader and rooted.
  • Also, you will use the CWM or TWRP custom Recovery in order to flash the new custom CM 10.2 Experimental ROM. If your device doesn’t feature any of these custom recoveries, then you won’t be able to flash the new files.
  • The tutorial contains the ‘factory reset’ step, an action that will remove all system files such as installed applications data, call logs, SMS, Contacts etc.,
  • Factory Reset won’t delete any contents from the internal storage.
  • If you want to backup data from installed applications then you can use the Helium app (here) from Google Play Store.
  • Backup all SMS text messages, call logs info or APN Internet Settings using the following tools for Android: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Root access has to be granted for some of these tools.
  • Sync your Contacts with your default Gmail account. This process will upload all your saved phone numbers to your Google cloud and all data will be restored after you enter the Google Account when the new CM 10.2 Experimental ROM is flashed.
  • It would be best for you to create a NANDROID Backup for the ROM that is currently installed on your device. This sets a restore point for your smartphone and it can be used in case something goes wrong during the installation.
  • Enable USB Debugging from Developer Options.
  • Make sure that you know what you’re doing before starting the installation.
  • We can’t be blamed in case you brick your device or lose important data after installing this new ROM.
  • Check the phone’s battery charge level and make sure that it is over 50%, it prevents the device from switching off during the CM 10.2 installation.
  • In case you cannot complete the installation at your first attempt, then you can always ask for more help in comments.

Now that you know all of the above, continue to the next part of this post and learn how to flash a brand new custom ROM for your device.

How to flash CM 10.2 Experimental Android 4.3 custom ROM for Sprint Samsung Galaxy Nexus:

  1. Download the CM 10.2 latest experimental build from here.
  2. Download the Gapps zip for Android 4.3 custom ROMs from here.
  3. Connect you Sprint GNex with your computer using the USB data cable.
  4. Move both zip files on to your phone’s internal storage. Disconnect the smartphone from PC when the files are copied successfully.
  5. Power off your smartphone now completely.
  6. Boot the device in Bootloader / Fastboot mode and then select the Recovery Mode option.
    – when you’re in Recovery Mode continue to the next step.
    – note that both CWM and TWRP recovery versions are supported by this guide.
  7. Create a NANDROID Backup for the ROM that is currently installed on your device.
    – CWM: select ‘backup and restore’, save the file to your device’s internal storage. Confirm.
    – TWRP: press Backup, select the system files you want to backup, then confirm.
  8. Now, apply the ‘factory reset’ for your Sprint Galaxy Nexus:
    – CWM: select ‘wipe data/ factory reset’ and confirm.
    – TWRP: press Wipe, then press Factory Reset button. Confirm this process.
    – after the files are wiped, continue to the next step.
    – it is not recommended for you to skip this step.
    – in case you skip this step and the phone shows force closing errors, it doesn’t boot or enters into a boot loop, then you will be forced to repeat the entire tutorial without skipping any of the steps I’ve listed.
  9. Now you can flash the CM 10.2 Experimental build for Sprint Galaxy Nexus:
    – CWM: select ‘install zip from sdcard’, find the CM 10.2 Experimental build. Confirm the installation.
    – TWRP: press Install, then browse the internal storage for the CM 10.2 ROM. Confirm that you want to install it by swiping the blue button at the bottom of the TWRP screen.
    – do not press any buttons until the new ROM is flashed.
    – if the installation fails at your first attempt, then you should repeat this step.
  10. After the ROM is installed you will need to repeat step 9 and install Gapps for Android 4.3 custom ROMs file.
    – this file flashes all the required Google applications for your smartphone.
    – when the Gapps zip is installed too, continue to the next step.
  11. Return to the main CWM / TWRP Recovery screen.
  12. Reboot your device in normal mode:
    – for CWM select ‘reboot system now’.
    – for TWRP press on Reboot, then press System.
    > note that the first boot process of CM 10.2 Experimental ROM will take a while before completing.
    > if the first boot process doesn’t finish loading the new ROM files after ten minutes have passed or the device enters into a boot loop, then you should repeat the entire tutorial and make sure not to skip any steps in the process.
  13. If all the files were installed with success, then you will see the CyanogenMod 10.2 Android 4.2 Experimental ROM screen. Enter your Google Account details and start testing all the new features and functions added by this new custom OS.

These were all the steps you had to follow in order to complete the guide.

If you’re having problems with completing the tutorial, then you should ask for extra help in comments. We will try to come up with a solution for any roadblocks you’ve encountered. Note that since this new Sprint Galaxy Nexus custom ROM is in its experimental phase, then you might find some errors or bugs while testing it.

Also, keep an eye on the CM Updater tool, it should be under Settings. This utility can be used to constantly check for new CM 10.2 build releases for the Samsung Galaxy Nexus Sprint. The updates can be applied by clicking only the Download and then Install buttons.

If you don’t like this new ROM, then you can always restore your Sprint Galaxy Nexus to its previous state using the NANDROID Backup file create in step 7. For any other questions, use the field below.