Southeast Asia owners of the Samsung Galaxy Chat GT-B5330 is now going to receive official Android 4.1.2 Jelly Bean update. This update Brings several improvements and features of Android Jelly Bean such as Google Now and Project Butter which boosts the phone's entire performance.
Firmware details
PDA: B5330XWUBMD2
CSC: B5330OLBBMD2
Version: Android 4.1.2
Built date: May, 2013
Regions: Indonesia, Malaysia, Philippines, Singapore, Vietnam, Thailand
Android 4.1.2 official update for Galaxy Chat is packed with the following features:
- Google Now service for intelligent voice search.
- Project Butter for smooth and responsive user interface.
- User interface and notifications of the Samsung UI has been improved.
- Boost in the overall performance of the handset.

The official firmware is now available for download via Over-The-Air (OTA) update as well as through Samsung KIES. However, those who fail to upgrade their devices with Android 4.1.2 XWUBMD2 Jelly Bean via official method, may follow our step-by-step guide to install the update manually.

Pre-requisites
1. Install USB Driver for Galaxy Chat B5330 on the computer.
2. Enable USB Debugging Mode on the phone by navigating to Settings > Developer Options (Android 4.0 or later) or go to Settings > Applications > Development (Android 2.3 or earlier).
3. Make a backup of all your important data before following the guide.
4. The  Galaxy Chat should be factory unlocked and not locked to any particular carrier.
5. Ensure the battery of the phone is charged more than 80 per cent.
6. The Android 4.1.2 XWUBMD2 Jelly Bean firmware is compatible only with Samsung Galaxy Chat B5330 and installing this on any incorrect variant will brick the device. Verify the model number of the Galaxy Chat by navigating to Settings > About Phone.
File Required
1. Android 4.1.2 XWUBMD2 Jelly Bean Firmware
2. Odin 3.07
Steps to Update Galaxy Chat B5330 with Android 4.1.2 XWUBMD2 Jelly Bean Firmware
Step 1: Extract Firmware zip file that you downloaded already from above link, you will get a .tar.md5 file and some other files.
Step 2: Extract Odin zip file and you will get Odin3 v3.07.exe along with few other files.
Step 3: Power off your phone. Wait 5-6 seconds for vibration to confirm complete switch off.
Step 4: Boot the device into Download Mode by pressing and holding Volume Down + Home buttons together and then press the Power button until the device turns on. Now press the Volume Up button to enter Download Mode.
Step 5: Run Odin on the computer as an Administrator.
Step 6: Connect the  Galaxy Chat to the computer using USB cable while it is in the Download Mode. Wait until Odin detects the device. When the device is connected successfully, the ID: COM box will turn yellow with the COM port number. Additionally, the successful connected will be indicated by a message saying Added. If Odin fails to detect the device then re-install USB driver.
Step 7: Choose the following files in Odin from extracted B5330XWUBMD2 firmware folder by using respective checkboxes:

• Select the PDA checkbox, and choose the file named .tar or .md5.
• Click the Phone checkbox, and choose the file with 'modem' in its name (ignore if there is no such file)
• Click the CSC checkbox, and select the file with 'csc' in its name (ignore if such file is missing)
• Choose the PIT checkbox, and choose the .pit file. Use only the file obtained during extracting in step 1 above, otherwise ignore it.

Step 8: In Odin, enable Auto Reboot and F. Reset Time checkboxes. Also, ensure the Re-Partition checkbox is chosen only if a .pit file was chosen in the previous step.
Step 9: Verify everything suggested in Step 7 and Step 8 is done correctly. Then hit the START button to begin the flashing process.
Step 10: Once flashing completed, your phone will restart and soon you will see a PASS message with green background in the left-most box at the very top of the Odin. You can now unplug the USB cable to disconnect your device from computer.

Samsung  Galaxy Chat B5330 should be now updated with official Android 4.1.2 XWUBMD2 Jelly Bean firmware. Head over to Settings > About Phone to verify the software version running on the device.

Note: If  Galaxy Chat B5330 stuck at booting animation after Step 10 then go to recovery mode (press and hold the Volume Up, Home and Power buttons together) and perform Wipe data/Factory Reset and Wipe Cache Partition task before selecting reboot system now function. In recovery mode use Volume keys to navigate between options and Power key to select the option. Please note, performing wiping task will erase your device internal memory data and not external SD card data.

Click here to know How to Root Galaxy Chat B5330 running on Android 4.1.2 Jelly Bean firmware.

Recognised XDA Developers, Chainfire recently released CF-Auto-Root file for variants of Samsung Galaxy Chat bearing model number GT-B5330/B/L.
CF-Auto-Root is the root for "rooting beginners" and those who want to keep as close to stock as possible. CF-Root is meant to be used in combination with stock Samsung firmwares, and be the quickest and easiest way for your first root. In essence, it does nothing but install and enable SuperSU on your system, so apps can gain root access. Head over to the CF-Auto-Root main thread to learn more about the root method.
Samsung Galaxy Chat B5330/B/L users who have already installed their devices with Android 4.1.2 Jelly Bean, may root their devices using the tutorial below.
Disclaimer: Rooting voids the warranty of your device. We and the developer of this rooting procedures shall not be held responsible if any undesirable outcomes may happen to your device. use of this root guide is solely at your own risk!
Pre-requisites
1. Install USB Driver for Samsung Galaxy Chat on the computer.
2. Enable USB Debugging Mode on the phone by navigating to Settings >> Developer Options (Android 4.0 or later) or go to Settings >> Applications >> Development (Android 2.3 or earlier).
3. Make a backup of all your important data before following the guide.
4. The Galaxy Chat should be factory unlocked and not locked to any particular carrier.
5. Ensure the battery of the phone is charged more than 80 per cent.
6. The CF-Auto-Root file works only on Samsung Galaxy Chat B5330/B/L. Applying this to any incorrect variant might brick the device. Verify the model number of the Galaxy Chat by navigating to Settings >> About Phone.

File Required
1. CF-Auto-Root for Galaxy Chat GT-B5330 (CF-Auto-Root-zanin-zaninxx-gtb5330.zip), GT-B5330B (CF-Auto-Root-zanin-zaninvj-gtb5330b.zip), or GT-B5330L (CF-Auto-Root-zanin-zaninub-gtb5330l.zip)
2. Odin 3.07
Steps to Root Galaxy Chat B5330/B/L Running on Android 4.1.2 Jelly Bean Firmware
Step 1: Extract CF-Auto-Root and Odin 3.07 files using winrar/7zip/winzip or any other extracting tool.
Step 2: Switch off the Galaxy Chat. Then boot the device into Download Mode by pressing and holding Volume Down + Home buttons together and then press the Power button until the device turns on. Now press the Volume Up button to enter Download Mode.
Step 3: Launch Odin on the computer.
Step 4: Connect the Galaxy Chat to the computer using USB cable while it is in the Download Mode. Wait until Odin detects the device. When the device is connected successfully, the ID: COM box will turn yellow with the COM port number. Additionally, the successful connected will be indicated by a message saying Added. If Odin fails to detect the device then re-install USB driver.
Step 5: In Odin, click the PDA button and select the CF-Auto-Root with .tar.md5 file.
Step 6: Verify that Auto Reboot and F.Reset Time checkboxes are selected in Odin. Also, ensure the Re-Partition option in Odin is not selected.
Step 7: Double-check and click Start in Odin. The installation process will now begin.
Step 8: Once flashing completed, your phone will restart and soon you will see a PASS message with green background in the left-most box at the very top of the Odin. You can now unplug the USB cable to disconnect your device from computer.
Samsung Galaxy Chat B5330/B/L running on Android 4.1.2 Jelly Bean firmware is now rooted successfully. You can now install any app that requires root permission. Verify the root status of the device by downloading Root Checker app from Google Play Store.