Do it at your own risk!!! Read complete guide once and then apply , if you skip any step then it can cause of bricked phone.
Follow this Guide on your risk and if your device gets damaged or bricked during the process, I am not responsible. Please follow steps carefully

Requirements

  1. CF root modified kernel for XXKI3 firmware – Mirrors | Multiupload link
  2. Download ODIN3-v1.85 from here  [use only this version otherwise it can bring serious problems]

Rooting Samsung Galaxy S II running Android 2.3.5 XXKI3 Firmware

  1. Unzip CF Root kernel file and you will see a .tar file, it is possible that your pc shows .tar file as extractable archive but don’t extract it further. save this .tar file on safe place like desktopCf-root-.tar-file-after-extracting
  2. Unzip Odin too and you will see two files first is .exe and second .ini Odin_tool
  3. Right click on Odin3 v1.85.exe and run it as adminRun-Odin
  4. Check Auto Reboot , F.Reset Time and leave Re-partition unchecked.
  5. Now click on PDA button and select CF-Root-SGS2_XX_OXA_KI3-v4.1-CWM4.tar Selecting-.tar-file
  6. After this, put your Samsung Galaxy S 2 in download mode.
  7. To do that Switch off your phone
  8. and press and hold volume down and middle key ,while holding both keys press power on key (don’t leave until it boots in download mode)
    if your phone is unable to boot in download mode don’t proceed to next step ,please try again until it boot in download mode
  9. Once your phone is in download mode, you can connect your phone to the computer via USB.
  10. Just after connecting you will ID COM box in Odin will turn yellow and in message box ADDED appears
  11. Click on the Start button and wait for the kernel flashing process to complete.
  12. During this process don’t stop Odin and don’t turn off phone.
  13. Once the process is over, your phone will reboot automatically

How to remove yellow warning triangle

  1. Download Stock kernel of XXKI3 | Password: intratech@XDA
  2. Extract it by double clicking on it ,you will get .tar file
  3. Now flash this .tar file on your phone , flashing procedure is same as above. you have to use kernel .tar file instead of cf root .tar file
(Big thanks to Kuldeep singh for this tutorial and as always XDA-DEVELOPERS.COM)
I AM NOT TAKING CREDIT OR DONATIONS  OR ANY OTHER BIT OF THE GREAT PRO BONO WORK DONE ON A REGULAR BASIS BY XDA DEVS THAT ARE INCLUDED IN THIS POST.
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