How to update AT&T Galaxy S2 SGH-I777 to UCLK3 Android 4.0.4 ICS official firmware

How to update AT&T Galaxy S2 SGH-I777 to UCLK3 Android 4.0.4 ICS official firmware... Now user can update AT&T Galaxy S2 SGH-I777 to UCLK3 Android 4.0.4 ICS official firmware.

Here is the complete tutorial how you can it. Before going to forward, do not forget to backup all your personal data and apps.

UCLK3 Android 4.0.4 Firmware Details:

• PDA: I777UCLK3
• CSC: I777ATTLK3
• Version:
• Date: 2012-12-21
• Regions: USA (AT&T)

Installed all your USB DRIVERS FOR AT&T Galaxy S2 SGH-I777 through PC. Some things you should keep in mind.

1. Enable the Debugging Mode. By enable the debugging mode you can connect own android phone with PC.

2. You should check your battery. Your batter should be 80% to 85% charges. If your phone will be off during flashing ROMs or installing mods and updates due to low battery. Then your Phone will be dead permanently.

3. As, i told you. You should back up all your date. You will need it for new ROM.

4. Your Phone should be Unlocked.

Now we move forward and important part.

Here is the complete detail in different steps.

Read the all steps carefully.

Step 1
Download Android 4.0.4 I777UCLK3 for Galaxy S2 to your computer and extract the zip file.

Step 2
Download ODIN v1.85 which will help you to install Android 4.0.4 on AT&T Galaxy S2 SGH-I777.

Step 3
Switch OFF your phone. Now go to Download Mode. How? Press and hold the Volume Down + Home buttons together, and then press the Power button till you see the construction Android robot and a triangle. Press Power again to confirm to enter into Download Mode.

Step 4
Make sure you have your Galaxy S2 USB drivers installed on your computer.

Step 5
Open ODIN on your computer. Connect your phone to your computer while your phone is in the Download Mode.

Step 6
If your phone is connected successfully, one of the ID:COM boxes will turn yellow with the COM port number. This step might take some time.

Step 7
Now select the files that you have to flash/install on your phone. These files are to be found from the extracted files in Step 1.

    Click on ‘PDA’ and select file with ‘CODE’ or ‘HOME’ in its name.
    Click on ‘Phone’ and select file with ‘MODEM’ in its name. Ignore this step if there is no such file.
    Click on ‘CSC’ and select file with CSC’ in its name. Ignore this step if there is no such file.
    Click on ‘PIT’ and select the .pit file. Ignore this step if there is no such file.

Step 8
In ODIN, check the Auto Reboot and F. Reset Time options. As for the Re-Partition option, check it ONLY if you selected a .PIT file in the above step.

Step 9
Now click on the Start button in ODIN. Installation process will start and would take a few minutes to complete.

Step 10
After the installation is completed, your phone will restart. After you see the home screen, unplug your phone from the computer.

That’s it. Your AT&T Galaxy S2 has now been updated to Android 4.0.4 build UCLK3 software update. Go to Settings > About phone to verify what build have you installed.

Now AT&T Galaxy S2 SGH-I777 updated to UCLK3 Android 4.0.4 ICS official firmware.