How to ODIN: flash/install Upgrade Samsung Galaxy S II to Android 2.3.4 Gingerbread I9100XXKG2 Stock Firmware Update

Here's a step by step instructions on how to manually upgrade your Samsung Galaxy S II to the latest android 2.3.4 Gingerbread I9100XXKG2 Stock ROM firmware by way of flashing it using ODIN downloader tool.

Disclaimer: We shall not liable what may cause or happen like bricking your device, you may need to understand that if you follow this guide is at your own risk. You are already warned! proceed with precautions.

Firmware: Android 2.3.4 Gingerbread I9100XXKG2

PHONE:  MODEM_I9100XXKG2_REV_02_CL1037208.tar.md5
PDA:  CODE_I9100XXKG2_CL375027_REV02_user_low_ship.tar.m d5
CSC: GT-I9100-CSC-MULTI-OXAKG2.tar
           GT-I9100-CSC-HOME-MULTI-OXAKG2.tar.md5
KERNEL_I9100XXKG2_CL375027_REV02_user_low_ship.tar .md5

Download
Download via samfirmware

pass:samfirmware.com

Region: Austria, Benelux, France, Germany, Hungary, Italy, Spain, UK,
Available languages:
Note: this information might not be fully correct on Android phones
Cestina
Dansk
Deutsch (Deutschland)
Deutsch (Osterreich)
Deutsch (Schweiz)
English (Australia)
English (Ireland)
English (New Zealand)
English (South Africa)
English (United States)
English (United Kingdom)
English (Phillipines)
Espanol (Spania)
Espanol (Estados Unidos)
Estonian
Francais (France)
Francais (Suisse)
Hrvatski
Icelandic
Irish
Italiano
Kazakh
Latviesu
Lietuviu
Macedonian
Magyar
Nederlands (Belgie)
Nederlands (Nederland)
Norwegian
Polski
Portugues
Romana
Slovencina
Slovenscina
Suomi
Svenska
Turkce
Russian
Korean

Build: July 2011

Note: This is a leak firmware version most likely based from original released.

-Back up all necessary files stored on the phone for it will be all wipe out during this process
-Use PC running on Windows OS or later
-Disable KIES and antivirus software
-Use a good PC to Phone USB cable
-Remove SIM card and SD card (safe for beginners to avoid issues )
-Make sure that the battery is fully charge


How to Install or flash the firmware using ODIN Downloader: 
1. Extract the downloaded firmware file in a new folder (use winrar to unzip).
2. Run ODIN Multi Downloader v1.85
3.Click on the PDA button then select and load:
CODE_I9100XXKG2_CL375027_REV02_user_low_ship.tar.m d5

Click on the PHONE button then select and load:

MODEM_I9100XXKG2_REV_02_CL1037208.tar.md5

Click on the CSC button then select and load:

GT-I9100-CSC-MULTI-OXAKG2.tar

DO NOT PUT .PIT FILE.

On checkboxes options: Make sure that the RE-PARTITION is uncheck, only the F-RESET and AUTO REBOOT are checked.  

Loading Binary files of  XXKG2 with ODIN downloader tool

4. Reboot  the Samsung Galaxy S II  into DOWNLOAD MODE.
Turn the phone power OFF, then press and hold VolumeDown+OK+Power at the same time.
Then connect the Phone to PC, the ID:COM box will turn to yellow color if the device is already detected and properly connected. Try to use another USB port, USB cable and or PC if experiencing a connection issues.

Samsung Galaxy S II Download Mode Button Combination

5. Hit the "START" Button to begin flashing the firmware.
The phone will be flashed and once it’s finished, it will boot up.Do NOT disconnect the usb-cable, remove the battery or otherwise interrupt this process! The process will take just about 5-minutes to complete.
But if you do not see a blue progress bar on your phone after 5 minute, take out your phones battery, unplug your phone and start from step 1 again.

6. Once you see the message "PASS!", you have successfully flashed your phone.
The phone will reboot when flash or download completed.

Odin window when flashing successfully finishes

7. You may then confirm the newly installed firmware version
*#1234#

For Full Reset
*2767*3855#

Just change the default language according to your locale or region. You may also need to root back the phone after flashing it with the firmware build XXKG2.