How to ROOT Galaxy S2 i9100G via Zip

  1. Download : Root_S2_i9100G.zip
  2. Place it on the root of SD card. 
  3. Then goto Recovery mode by holding <Home+Power+Vol Up>
  4. Select the Zip.
  5. Install it.
  6. Reboot 
ClockWorkMod for Galaxy S2 i9100G

  1. Download : CWM_S2_i9100G.zip
  2. Place it on the root of SD card. 
  3. Then goto Recovery mode by holding <Home+Power+Vol Up>
  4. Select the Zip.
  5. Install it
  6. Now you will see the CWM recovery instead of Default Samsung Recovery mode
How to flash ROMS for Galaxy S2 I9100G via ODIN
Download ODIN > Odin3-v1.85.zip
Download Galaxy i9100G compatible PIT File > omap4_all_20110627_emmc.pit
  1. Download Odin3-v1.85.zip > Open It!
  2. ADD PIT File (omap4_all_20110627_emmc.pit) into ODIN > PIT.
  3. Add Your ROM into ODIN > PDA 
  4. Turn Off your Phone first
  5. Then goto Download mode by holding <Home+Power+Vol down>
  6. Continue step of the Phone Screen.
  7. Plug in the USB cable > You will notice ODIN recognize it by Yellow filled square .
  8. Click "Start" of ODIN.
...... keep watching and praying for few mins! (hopefully 1-2mins)
... and voila! you just flashed your phone into a new ROM!

Enjoy!

-Harsha