Update Galaxy S3 I9300 to Android 4.2.2 Jelly Bean via SlimBean Build 3 ROM [How to Install]
Update Galaxy S3 I9300 to Android 4.2.2 Jelly Bean via SlimBean Build 3 ROM [How to Install]

The Galaxy S3 I9300 has been in the spotlight ever since its release and rising demand for the smartphone from Android community has further fuelled developer support, leading to a number of custom ROM Jelly Bean releases.

This release - the SlimBean Build 3 ROM - gives the high-profile smartphone stock-like Android experience with superior customisation options. It offers a fast and stable Jelly Bean experience in a lightweight package.

Key Points

  • The SlimBean Build 3 ROM and the instructions given in this guide are meant for the international variant of the Galaxy S3 I9300 only. Verify device model number by navigating to Settings > About Phone
  • Back up data and settings via a recommended custom recovery tool, like ClockworkMod (CWM) or TWRP; it creates a complete image of the existing phone setup
  • Verify correct USB drivers (for the phone) are installed on the computer [download Samsung Galaxy S3 I9300 USB drivers]
  • Double check and ensure USB debugging mode is enabled on the phone, by navigating to Settings > Developer Options (if device runs Android 4.0 or later) or Settings > Applications > Development (if device runs Android 2.3 or earlier). If device runs Android 4.2, perform the following steps:
    • Go to Settings > About Phone
    • Scroll to bottom of screen and select Build Number
    • Tap phone's Build Number seven times to unlock or reveal the hidden Developer Options under Settings. Then select checkbox to enable USB debugging mode under Settings > Developer Options
  • Make sure phone has at least 80 percent battery charge to prevent unexpected device shutdown (due to battery drain) while installing ROM
  • Ensure device is unlocked (not locked to a specific carrier) and rooted with CWM Recovery
  • If device is stuck at booting or experiencing boot loop issues, perform Wipe Cache Partition and Wipe Dalvik Cache a few more times before rebooting
  • Allow newly installed ROM to stabilise for five minutes before you start working
  • Instructions provided in this guide are meant for reference purposes only. IBTimes UK will not be held liable if device is damaged or bricked during or after firmware installation. Users are advised to proceed at their own risk


How to Update Galaxy S3 I9300 to Android 4.2.2 Jelly Bean via SlimBean Build 3 ROM

  • Connect phone to computer with USB cable
  • Without extracting, copy downloaded ROM and Google Apps zip files to root folder on phone's SD card
  • Disconnect device from computer and turn off phone
  • Boot phone into ClockworkMod Recovery by pressing and holding Volume Up, Power and Home buttons until Samsung logo appears. Then release all three buttons and press again. The device will now enter CWM Recovery. Use Volume keys to navigate between option and Power to select an option in Recovery
  • Take a Nandroid backup of the existing ROM so it can be restored later if the new ROM fails to work or you want to return to the original ROM. To backup, choose Backup and Restore and then tap Backup on next screen. Return to main Recovery menu once task is complete
  • Perform a full data wipe task. To do so, click Wipe Data/Factory Reset > Yes. Wait until process completes and return to CWM Recovery main menu and select Wipe Cache Partition. Once wipe process is done, click Wipe Dalvik Cache under advance options
  • Choose Install Zip from SD card and then Choose Zip from SD card. Now, locate SlimBean Build 3 ROM zip file copied to phone in and select by tapping Power. Confirm ROM installation by choosing Yes on next screen and installation process will begin
  • After ROM installation process completes, repeat above step with SlimBean GApps zip file
  • Once Google Apps is installed, return to Main Recovery Menu and click Reboot System Now to reboot the phone into newly installed SlimBean Build 3 custom ROM. Be aware first boot may be time-consuming
  • Restoring Previous ROM: To return to previous ROM, boot into Recovery, choose Backup and Restore and then restore original ROM by choosing it from the list

The Android 4.2.2 Jelly Bean-based SlimBean Build 3 ROM is now installed and running on the Galaxy S3 I9300.

[Source: Android Jinn]