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Flash Official CM 10.2 Stable Jelly Bean ROM for Samsung Galaxy S3 I9300

The Official CyanogenMod 10.2 Stable build based on Android 4.3 has been launched for the Galaxy S3. So, if you didn’t update your smartphone to Android 4.4 via other custom ROMs, then you should try the new Android 4.3 stable build from CyanogenMod. Read this entire tutorial and you should be able to complete the guide in no time.

CM 10.2 Stable is the custom ROM that all the Android 4.3 JB AOSP features along with tons of other CyanogenMod additions. Read the guidelines below and you will learn how to successfully configure the device, so that you’ll finish the installation at your first attempt. Here’s what you need to know:

  • use this guide only with the Samsung Galaxy S3 model number I9300.
    – do not attempt to update any other smartphones with the build that you find in this article.
  • your Galaxy S3 has to be rooted and running the latest CWM or TWRP Recovery image.
    – without these installed you cannot complete the tutorial.
  • ‘factory reset’ is required before installing the new ROM.
    – this process will wipe data from system partition, while leaving the internal /external storage unaffected.
    – do not skip the ‘factory reset’, as your device will not boot in normal mode.
  • it would be best for you to create a full NANDROID Backup for the installed ROM.
    – this will set a restore point for your device and you will be able to use it in case the new ROM doesn’t boot in normal mode.
    – this step is listed in the tutorial.
  • backup data from installed applications using Helium for Android from Google Play Store — link here.
  • backup SMS text messages and APN Internet Settings using the following tools for Android: SMS backup & restore | APN Settings Backup & Restore.
    – root access is needed for these apps.
  • sync Contacts with your default Gmail account.
    – guide here for those that don’t know how to do it.
  • enable USB Debugging from Developer Options.
  • check the phone’s battery power level and make sure that it is over 50%, so that the phone won’t switch off in the middle of the updating process.
  • this is a guide for advanced users, don’t skip any steps and read the entire post before starting the update.
  • don’t blame us in case something goes wrong during the installation process.
  • if you cannot complete the tutorial, then you should ask for more help in comments.

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

How to flash CyanogenMod 10.2 Android 4.3 Stable ROM for Galaxy S3 I9300:

  1. Download the CM 10.2 Stable from here.
  2. Download Gapps for Android 4.3 ROMs from here.
  3. Connect your smartphone with your PC, then copy both zip files to Galaxy S3 internal storage.
    – do not unzip these files.
    – after the files are copied then you can disconnect the phone from PC.
  4. Power off your smartphone now.
  5. Boot it into CWM / TWRP Recovery now.
    – if you don’t know how to boot custom Recovery Mode, then you should read the info here.
  6. First, create a full NANDROID Backup for the installed ROM:
    – CWM: select ‘backup and restore’, save the file and continue to the next step.
    – TWRP: press Backup, then rename the file and save it on your device.
  7. Next, apply ‘factory reset’
    – CWM: select ‘wipe data/ factory reset’, confirm.
    – TWRP: press Wipe, then swipe to confirm Factory Reset.
    > don’t skip this step, as the new ROM won’t boot successfully.
  8. Now you can flash the CM 10.2 Jelly Bean 4.3 Stable ROM for your Galaxy S3:
    – CWM: select ‘install zip from sdcard’, then ‘choose zip from sdcard’. Find the ROM zip and install it.
    – TWRP: press Install, then search the internal storage for the CM 10.2 Stable zip. Confirm the installation.
    > don’t press any buttons until the installation is complete.
  9. After the ROM is installed, repeat step 8 actions and flash the Gapps zip too.
  10. When both files are installed, return to the main custom Recovery menu.
  11. Reboot your phone now in normal mode.
    – note that the first boot process takes a while to complete and you shouldn’t press any buttons until you see the home screen of CM 10.2
  12. Create your CyanogenMod account, then reboot the phone once again and start testing the new custom ROM features.
    – also, make sure to enter your default Google account info in order to restore all contacts data.

These were all the steps that you had to take, now you can test the ROM.

In case the first boot process takes more than ten minutes to load all new files, or the phone enters into a boot loop, then you will be forced to repeat the entire tutorial once again. If you do repeat the tutorial, then you should make sure not to skip any steps that I’ve listed above.

If you cannot complete the guide then you can ask for more help in comments.

If you don’t like how CyanogenMod 10.2 stable works with your Galaxy S3 I9300, then you can choose to restore the phone to its previous ROM using the NANDROID ROM Backup file created in step 6.

Samsung Galaxy S3 Articles