Install UK Samsung Galaxy S3 I9300XXELLA 4.1.2 Fix Exynos Memory Bug OTA/Kies Official Update

Samsung  now officially rolling out the new Android 4.1.2 Jelly Bean update for Samsung Galaxy S3 GT-I9300 in UK. This update brings the important role to fix the infamous Exynos memory bug that has been reported as a treat to users affected devices like Samsung Galaxy S2/S3, Galaxy Note 2 and all other Exynos based devices.  If your device is affected, it would enable anyone with an evil intentions and could build an app to possibly access sensitive data like passwords and even credit card information which are stored in the physical memory.  This a serious issues and could be dangerous and even fatal for the security of such devices, so this update is truly very important to Galaxy S3 users.

Update Build: I9300XXELLA Android 4.1.2 Jelly Bean

The firmware build number is I9300XXELLA an update from earlier released I9300XXELL4. United Kingdom is the first country to receives  this update via Samsung Kies and OTA (Over the Air). So, just check it out right now, the I9300XXELLA weighs around 21.38MB.

Device: Samsung Galaxy S III GT-I9300 (unbranded)
Region: Europe
Country: United Kingdom
Build Number: JZO54K.I9300XXELLA
Android version: 4.1.2 aka Jelly Bean
Baseband/Modem: I9300XXELLA
Build Date: Dec-22-2012
Released Date: Jan-02-2013
Changelist: 742798

You can directly check the update thru your device Settings>About>Check for Update or just grab the latest Samsung Kies for Galaxy S III GT-I9300 and follow the step by step procedure on how to upgrade from Samsung UK support page.

How to Manually Install the I9300XXELLA Android 4.1.2 Latest Official Firmware on Samsung Galaxy S3

Thus who now runs with rooted or custom firmware and modifies recoveries can’t get this update officially from Kies or OTA, since the device is already modified,  Kies or OTA updates will just fails your devices from updating.
This is the procedure on how to manually upgrade the Samsung Galaxy S3 to official Android 4.1.2 Jelly bean I9300XXELLA. This firmware is compatible with all Samsung Galaxy S3 with model number GT-I9300 only  (International version) and cannot be used on U.S and Canada Galaxy S3 variants like SGH I747/M, SCH-I535, SGH-T999/V and  SPH-L710 and so on.

Warning: This method is for advance users only, typical users who did not touch or modify their devices can simply update on Kies and OTA only.

Grab Odin flasher tools and USB Driver: 
Odin3_v3.07 link
GT-I9300 USB Driver
Grab the original I9300XXELLA unbranded Stock ROMS:
United Kingdom: GT-I9300_BTU_I9300XXELLA_I9300OXAELLA Download

Disclaimer: Proceed and use this method solely at your own risk!

FAQ about flashing Samsung Galaxy S III (GT-I9300) I9300XXELLA stock ROM:

Q: Did it increase the flash counter of the phone?
A: No, flashing original stock firmware will not trip  your phone’s flash counter, it only increases when you install any custom ROM, unofficial or leaked firmware.

Q: My phone is already rooted, does it remove root?
A: Yes, once you flash official firmware it will return to its original factory default settings, you will lose root and you need to root again.

Before you proceed prepare the necessary things as follows:
– Create a sync and backup all your personal data, like: Contacts, Messages, Applications, Pictures and Videos, so that you will not lose it just in-case something might went wrong after the update.
– Make sure that the phone’s battery is fully charge to ensure stability and avoid power failure issues while updating.
-Close all softwares, such as KIES suite, Antivirus, firewalls, to prevent the possible conflicts.
-Prepare a personal computer or laptop with Windows XP, Vista, 7 or later OS, and you must deactivate the antivirus from your computer and you must have an administrator access, to be able to download and install the drivers.

Install I9300XXELLA Official Jelly Bean Odin Flashing Procedure for Galaxy S3 GT-I9300

1) Extract or unzip the downloaded  firmware or stock ROM so that you’ll get the Odin flashable tar.
SS_DL.dll (this cannot be used but do not delete, it’s the Kies firmware extension driver file)

2) Run Odin Downloader v3.07 flasher program.

3) Load the binary file.  Click on the PDA button then browse to the folder where you extracted the stock ROM.
ex. UK –KIES_HOME_I9300XXELLA_I9300OXAELLA_742798_REV00_user_low_ship.tar.md5
4. Do Not check the Re-Partition checkbox. Mark check these checkboxes Auto Reboot and F-Reset Time.
5. Reboot the phone in download mode: To reboot the Galaxy S3 into  download mode , you need to turn the power off.  After it completely shut down,  just  press and hold theVolume Down key,  Home button and the Power ON/OFF button simultaneously.
Samsung Galaxy S3 Download Mode buttons Volume Down,HOME,Power keys
You should then prompted into a warning screen and asking you  to press volume up if you want to continue or volume down to cancel, just simply press volume up to get into download mode. The download mode then displays an Android robot and say’s “Downloading.. Do not turn off target!!”
6. Connect the phone to PC when it’s in the Download Mode screen.
7. Hit the “START’ button.
10. Wait until a word “PASS’ appears.
11. Remove the phone from PC once completely reboots.

Odin Install Android 4.1.2 I9300XXELLA Jelly bean Fix Exynos memory exploit Galaxy S3

You may then confirm the newly installed Jelly Bean from your device:
About>Settings> Firmware info or type *#1234# and see if it’s already I9300XXELLA 4.1.2 Jelly Bean build.