Update AT&T Galaxy S2 SGH-I777 to Official Android 4.1.2 Jelly Bean UCMD8 Firmware

June 24, 20133 Comments

Samsung Galaxy S2’s AT&T variant gets a new official Android 4.1.2 Jelly Bean update. UCMD8 Android 4.1.2 Jelly Bean Firmware is now available to be installed on Galaxy S2 smartphone. This update is a very recent one for Samsung’s this stunning smartphone. Here we’ll be guiding you how you can install this official UCMD8 Android 4.2.2 Jelly Bean Firmware on Samsung Galaxy S2’s AT&T variant. Following step by step installation guide will help you to update your device manually, have a look!

Galaxy S2

Disclaimer :

This official UCMD8 Firmware is only available for AT&T Samsung Galaxy S2 smartphone. You are requested not to apply this update on any other Android smartphones or Tablets. It may get you many undone results with some bug problems. We are not responsible for any unwanted outcomes by applying this update on your device.

Requirements :

  • Your Galaxy S2 must be a rooted one and CWM recovery must have installed in it.
  • Make sure USB Debugging is enabled on your phone.
  • Go to: Menu>>Settings>>Apps>>Developer>>USB Debugging
  • Have a backup of your device’s data like texts, contacts, documents and all the other.
  • Have a proper data cable to connect this device to the PC.
  • Your device should be charged up to 80% to load the whole process.

Update Galaxy S2 SGH-I777 with Official UCMD8 Jellybean 4.1.2 Firmware :

Step 1 :

Step 2 :

  • Download Odin Tool to install this update on your device. If you don’t know from where to download this tool, you can simply download it from the below link.
  • Download Odin Tool :

Step 3 :

  • Turn of your Galaxy S2 and reboot it in recovery mode.
  • You can do so by pressing and holding Volume down+home buttons together. When you see something on your device’s display, press power button.

Step 4 :

  • Now, launch Odin tool which we have downloaded from the second step.

Step 5:

  • Connect your  Galaxy S2 to the PC by using a proper data cable.

Step 6 :

  • Once the device get successfully connected to the PC, Odin box will turn Yellow. You are allowed to install this official firmware on your device.

Step 7 :

  • From the Odin tool, select PDA and browse the Android 4.1.2 official firmware file.

Step 8 :

  • Click on to Start button to run the installation process.

Step 9 :

  • Once it get successfully done,  you will have a PASS message from Odin tool.

Step 10 :

  • You’ve successfully installed an Official UCMD8 Android 4.1.2 Jelly Bean Firmware on Samsung Galaxy S2’s AT&T variant. If you want to check this update manually from your smartphone, follow the below path from your device.
  • Go to: Menu>>Settings>>About Phone>>Software Firmware

This is what you need to know to install an official Android 4.1.2 Jelly Bean firmware on Samsung Galaxy S2 smartphone. If you are facing any problem while applying this firmware, feel free to comment over here. We’ll try our best to resolve your problems. We’ll be back with some more updates for other Android smartphone, till then stay tuned with us.


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Comments (3)

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  1. DINU says:


    i updated my samsung galaxy at&t sgh i777 phone to android vertion 4.1.2 after that its showing some proble range some times dissconneted in comming calls n out going calls msges some times works ,when we try to attemp acall range will gone kindly gide me ,n give me a solution

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  2. richard Allen says:

    i am trying to install the CWM recovery..and every forum i’ve seen says to use Rom Manager to install it..and when i boot to recovery it is not there…is there any other way or can you please send me a download link for the file?? b/c i have a different program that will flash the recovery…i just need the file…Any help will be appreciated..thank you!! -Richard Allen

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  3. Richard Allen says:

    Im still having the problem of not being able to flash the CWM recovery..also when i tried to download the jelly bean update it says the file has expired..can someone plz help me….thank u :-)

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