How to Install Android 4.2.1 SuperNexus 2.0 on Galaxy S3 I9300 Jelly Bean Custom Firmware

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Android 4.2.1 SuperNexus 2.0 build is out for the Galaxy S3 I9300 for download. Android 4.2.1 is not available yet through official Samsung update, but you can experience pure Android by installing SuperNexus 2.0 Jelly Bean while enjoying the buttery goodness of original User Interface. This ROM is completely based on the latest Android 4.2.1 AOSP release. You would notice that there is no TouchWiz and SuperNexus 2.0 Jelly Bean will convert your S3 into a Nexus 4, giving you the ability to use Vanilla (Pure, without TouchWiz or any other enhancements) Android 4.2.1. You can update Galaxy S3 I9300 to Android 4.2.1 SuperNexus 2.0 Jelly Bean custom firmware using the tutorial below.

As you continue reading below, we will guide you through the entire process of how to install Android 4.2.1 SuperNexus 2.0 Jelly Bean on Galaxy S3 I9300 with complete steps. Don’t forget to read all the tips below that you have to keep in mind before proceeding. ClockworkMod recovery should be already installed on your Galaxy S3. Please make sure you backup all your data as given below because this tutorial will wipe your data. Let’s get to the tutorial now.

Disclaimer: All the custom ROMs and firmwares, official software updates, tools, mods or anything mentioned in the tutorial belong to their respective owners/developers. We (TeamAndroid.com) or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial ;-)

Android 4.2.1 SuperNexus 2.0 Features:

For a quick look at what features are offered by the SuperNexus ROM, read the long list below:

  • Fully Deodexed
  • Zipaligned APKs
  • Rooted (Super SU)
  • BusyBox Installed
  • No 3rd Party App
  • ZERO Bloatware
  • Android Source Code vastly improved and optimized (i.e. Bionic, Dalvik, Webkit, Framework, libcore, SQlite etc)
  • Official Jelly Bean Bootanimation (From Official Galaxy Nexus Android 4.2.1 Factory Image)
  • Init.d Support
  • UserInit Support
  • Bash & Nano Support
  • Native SIP/VOIP Support
  • HSPA+ Support
  • OpenVPN Support
  • EXT4 File System Optimizations
  • Galaxy S III Device Settings As An App
  • Large APN & SPN List
  • Framework Features:
    -Extended Power Menu (Reboot, Recovery, Download & Screenshot Options)
    -Improved Scrolling Cache
    -Tweaked Animation Values Of Progress Spinners (Silky Smooth Loading Spinners)
    -Enabled Rotation Lock Tile in Quick Settings for Phones (Previously was only enabled on Tablets)
  • Camera Features:-
    -Burst Shot (Up to 20 Images at once)
    -ISO Mode
    -Touch Focus Duration
    -Power Shutter (Click Power Button To Capture Image/Video)
    -Color Effects
    -Shutter Timer
    -Zero-Shutter Lag (On Specific devices)
  • Browser Features:-
    -Increased Maximum Tab limit from 16 to 64
    -Incognito Tab Option (When long pressed on an URL)
    -Option To Close All Tabs With One-Click
    -Allowed Any Type Of File To Be Downloaded
  • Phone Features:-
    -T9 Dialer Support
    -Landscape Dialer Support
    -Transparency To Incall Screen
    -Noise Suppression
  • Miscellaneous Features:
    -Allowed Installation Of Apps From Unknown Sources By Default
    -Allowed Any Type Of File To Be Sent/Received Via Bluetooth
    -Disabled Data Roaming By Default
    -Removed Google’s Software Updates Option from Settings
    -Enabled Gesture Input By default
    -Hardware Information of the device (Settings>About Device>Hardware Information)

You might want to read these:

Samsung Galaxy S3 USB Drivers

You will need to connect your Android phone with the computer. For that, please make sure you have installed the USB drivers for Samsung Galaxy S3 properly. If not, you can download the latest official drivers from our Android USB Drivers section here:

Download Samsung Galaxy S3 USB drivers!

Backup and Other Important Tips

Done with the USB drivers? Perfect. The tutorial is on the next page, but first, please take a look at the following tips and important points you need to take care of. These are important, as we don’t want anyone losing their personal data or apps:

Always backup your important data that you might need after you install a new custom ROM, an official software update or anything else. Make a backup for just in case, you never know when anything might go wrong. See below for some tips on how to backup data:

Samsung users can also back up data using Samsung KIES. If you backup data manually, you get more options what to choose from and it is very easy to move data across Android devices from different manufacturers, i.e moving Samsung Galaxy Note backup data to HTC One X.

If you already have a custom recovery (ClockworkMod, TWRP etc.) installed on your phone, we strongly recommend a backup using that as it creates a complete image of your existing phone set up.

A few more optional tips that you should remember:

1. Having problems connecting your Android phone to the computer? You need to enable USB debugging mode. See here: How to Enable USB Debugging — for Gingerbread, Ice Cream Sandwich and Jelly Bean.

2. Make sure your Android device is charged up to 80-85% battery level. This might help you: How to Check Battery Percentage. Why? Because, if your phone goes off suddenly while installing a custom ROM, flashing an official firmware update or installing mods etc. — your phone might get bricked or go dead permanently. No one wants that, right?

4. Most of the tutorials and how-to guides on Team Android are for factory unlocked Android phones and tablets. We recommend NOT to try our guides if your phone is locked to a carrier, unless we have specified the carrier name or device model.

If you find the above tips useful and they were helpful to you, please consider giving us a +1 or LIKE to thank us!

All set and ready? Good. Now, let’s proceed with the tutorial on the next page and update Galaxy S3 I9300 to Android 4.2.1 SuperNexus 2.0 Jelly Bean custom firmware.