If you are an owner of Samsung Galaxy S3 and still waiting for Android 4.2.2 Jelly Bean, here is something you should have a look at:

SuperNexus, the ROM built from Google's AOKP Source that lets non-Nexus devices enjoy Nexus-like features, is here with Google's latest Android 4.2.2 Jelly Bean JDQ39 firmware for your Samsung Galaxy S3 GT-I9300 device.

Before you go ahead with rooting your device to Android 4.2.2 Jelly Bean JDQ39, here is a quick look at what the SuperNexus build 3 has got to offer to your device:

SuperNexus Build 3 features:

• 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
• Rsync Support
• UserInit Support
• Bash & Nano Support
• Native SIP/VOIP Support
• OpenSSH Support (ssh, sshd, scp, stfp)
• HSPA+ Support
• OpenVPN Support
• EXT4 File System Optimizations
• Galaxy S3 Device Settings As An App
• Large APN & SPN List
• Options for switching between USB Mass Storage and MTP/PTP (On Specific Devices)

Whenever people go for rooting there are always chances of the device experiencing bricking issues. That only happens if the rooting is not done properly and the instructions are not followed step-by-step.

Follow these steps to prepare your device for the big task:

1:  The process is meant only for Galaxy S3 I9300. Therefore, the users are advised to check their devices' model number in: Settings > About phone.

2: Make sure the device has at least 80 percent of battery backup.

3:  Download and install USB drivers for your Galaxy S3 and enable the USB debugging mode.

4: Back-up all your important data.

5: All the custom ROMs, firmware, official firmware updates, tools and anything mentioned in this tutorial belong to their respective developers. Mobile&Apps will not be held responsible for anything that goes wrong.

6: Download SuperNexus 2.0 I9300 Build 3 (SuperNexus-2.0-i9300-BUILD3.zip): Development Page to your Windows PC.

7: Download Google Apps Package (gapps-jb-20121212-signed.zip)

Now you are all set to start the smooth task, just follow the instruction given below step-by-step:

1: Connect your Galaxy S3 to your computer via micro USB cable.

2: Copy and paste the downloaded SuperNexus-2.0-i9300-BUILD3.zip to your phone.

3: Switch the device off and detach the USB cable.

4: Press and hold the Power + Volume Up + Home Button to enter CWM/TWRP Recovery.

5: In Recovery menu, you are always recommended to perform a full Wipe Data/Factory Reset to avoid crashing and ROM compatibility issue. It is an optional step if you upgrade from your previous ROM version. For CWM recovery, use Volume key to navigate in Recovery Mode. For TWRP, use touchscreen to navigate in Recovery Mode

6: Do Wipe Cache Partition - Select from the menu and select Yes to confirm.

7: Go to advanced and do Wipe Dalvik Cache - Select from the menu and select Yes to confirm.

8: From the main menu in Recovery, select the install zip from SDcard, then select choose zip from internal SDcard, browse to folder location and select the SuperNexus-2.0-i9300-BUILD3.zip and click Yes to install.

9: Back to main menu in Recovery, select the install zip from SDcard, then select choose zip from internal SDcard, browse to folder location and select the gapps-jb-20121212-signed.zip file and click Yes to install.

10: After the installation completes, go back to recovery's main menu.

1.            Select reboot system now to reboot the phone.

2.            For first boot up, it normally takes longer time. Please wait patiently.

Disclaimer: This installation is done using Stock Rom.