Pre Upgarded Instructions for this Process:
1.Make sure that your phone is Samsung Galaxy S2 not any other.If you try this process on any other phone then the phone will be damaged.
2.Create a backup of your all useful phone data with the help of backup apps that ensure your phone data.
3.This process will take several minutes or may be hours so make sure that your phone battery consumption is maximum.
4.Remove the SIM card and external storage SD card.
5.Download both these files.
Download Gingerbread 2.3.4 XXKGI Firmware
Odin3 v 1.83
Procedure for Update Samsung Galaxy S2 GT I9100 to Gingerbread XXKG1 2.3.4 Firmware.
1.Open the Odin.exe file you will see the window image on your screen.2.Switch off your phone then press and hold the Volume Button with the Power Key to turn the phone into the download mode.
3.Now connect your phone via USB cable to the computer.After connectivity you will see the window screen in which you see the COM ID 5 as a yellow color.
4.Now add the following files in the corresponding options:
5.Click on the "Start button".Then updation process is start and wait for some time.Please don't interrupt your device will installation.
PIT – u1_02_20110310_emmc_EXT4.pit
PDA – CODE_I9100XXKG1_CL349526_REV02_user_low_ship.tar
Phone – MODEM_I9100XXKG1_REV_02_CL1034110.tar
6.When the installation is completed reboot your phone and remove cable connectivity.The previous version of this firmware is also stored in cache memory.Remove your previous firmware version by dialing*2767*3855#.Now Update and check the latest version by dialing *#1234#.