How to Root Samsung Galaxy S2 I9100G

There are many ways to root I9100G, but the simplest way is using "S2 Root" tool developed by a developer on xdaforums. For this to work, first you must flash an insecure kernel or any custom kernel using odin.

Follow the below steps exactly as mentioned by its developer.

Step 1: Download Odin3 v1.85

Step 2: Download Insecure/Original Kernels from HERE or Download Superatmos Kernel(2.1) here(Better)

Step 3: Goto Settings > Applications > Development and Enable USB Debugging on your device.

Step 4: Reboot your device into Download Mode. (With Device OFF, Hold Vol Down + Home + Power) If done correctly your device should have a big Yellow Triangle in the middle of the screen with the words 'Downloading... Do not turn off target' underneath. (Or Press 'Jump To Download Mode' Button in S2 Root).

Step 5: Connect your device to your PC and start Odin3 v1.83. If you installed Samsung Kies correctly, you should see the box in the top left corner of Odin underneath where it says ID:COM should be Yellow and displaying the name of a Com Port your device is connected to.

Step 6: Check Odin's settings, Only the Auto Reboot and F. Reset Time checkboxes should be selected.

Step 7: Now press the PDA button and select the Insecure Kernel you downloaded earlier. (Note: This should be in *.tar, *.md5 or *.smd format.)

Step 8: Now press the Start button and wait for your device to reboot.

Step 9: If you have done everything correctly, you will notice a Yellow Triangle with an exclamation mark on the boot screen when the device is starting up. This indicates you are running an Insecure Kernel with Temp Root priviledges.

Step 10: When the device has finished booting, start S2 Root then press the Root Device button. Wait for the device to reboot depending on which Reboot option you selected then you are done Rooting.

Credits to Xda developer

How to flash a firmware through Odin on I9100G

Download Odin -http://www.megaupload.com/?d=LFZAHN19

1. Just download the firmware version you want from the sammobile.com and extract the .tar or .tar.md5 file in the archive and save it somewhere.

2. Reboot your phone to download mode.

To get the download mode shut down the device. After it shuts off completely, simultaneously press the Down volume key+ Home button + press the power button .

You should see a warning asking you to press volume up if you want to continue or volume down to cancel, press volume up. You are now in download mode.

3. Start Odin.

4. Click on the PDA button & browse to the .tar or .tar.md5 file that you have extracted in step 1

5. Don't put .PIT file & don't tick REPARTITION.

It should look like the below screenshot

6. Connect the USB cable and wait for the ID:COM section to turn yellow

7. Click start to flash

8. Do not disconnect the cable or turn off the device, it will reboot when it finishes.

It will not wipe your phone if you flash as recommended.

Credits to Intratech

Samsung Galaxy S2 I9100G guide

Samsung Galaxy S2 I9100G is the new variant of the most popular I9100 model. The main difference in the two models is in the make of Chipset and GPU.

I9100G:

CPU - TI OMAP 4430 (1.2Ghz)

GPU - PowerVR SGX540

I9100:

CPU- Exynos (1.2Ghz)

GPU - Mali-400MP

Despite the 1.2Ghz processor speed, the CPU speed is capped at 1008Mhz by stock roms in I9100G. This CPU capping does not affect overall performance in anyway. I9100G can play any game including EA Deadspace, Asphalt 6, ShadowGun HD,  Race of Champions, Brother in Arms like a charm. 

Issues in I9100G:

"Camera Failed" error pops out if you snap some shots say 5 or more continuously. The only way to make camera work again is by rebooting the mobile.

Frequent Hangs - The mobile becomes unresponsive at sometimes without any particular reason and must be restarted to get out of that.

Fixes:

If you have camera hang issue, you can flash other region firmware using Odin. It is reported that many users got rid of the camera hang issue when they changed their firmwares to other region firmwares. Personally I use DZKL3 firmware on my I9100G, which has no camera hang issues. You can get the original firmwares on sammobile website, type I9100G in search box of firmwares section and hit enter, then list of firmwares will be displayed.