Android 4.1.2 Jelly Bean has been released for AT&T Samsung Galaxy S2 finally! You can definitely update your phone via KIES or just follow this tutorial to manually update your smartphone to the latest official UCMD8 Android 4.1.2 Jelly Bean for Galaxy S2 i777 in case you haven't received the update yet.

Prerequisites to check before youupdate AT&T Galaxy S2 to Android 4.1.2 Jelly Bean UCMD8:

Downloadand install USB drivers forGalaxy S2 i777in your computer.Create backup of all the important data from your SGS2 i777.Enable USB debugging option by pressingMenu>Settings>Applications. Navigateand tap onDeveloper Optionsto ensure thatUSB Debuggingis enabled.Ensure that your Samsung Galaxy S2 i777 carries more than 70% of charge.

How to update AT&T Galaxy S2 to Android 4.1.2 Jelly Bean UCMD8:

Required files: downloadAndroid 4.1.2 Jelly Bean UCMD8for Galaxy S2 I777 andOdin 3.07in your PC. Extract the firmware file and you will get a.tar.md5file along with some other files (optional).Extract and install ODIN too on your computer.

Power off your AT&T Galaxy S2 and boot your device inDownloadmode.Once in Download mode, runOdin .exeas an Administrator on your computer (admin rights are required).Connect your Samsung Galaxy S2 i777 with your computer using the USB cable. Once connected, you will get a message in Odin’s message box saying“Added!!”.(In case you don’t get it, try another USB port. If that doesn't help either, then re-install USB drivers).In your Odin, click onPDAand locate the.tar.md5file with *code* appearing in its name. Do not change any settings. Make sure that theAuto RebootandF. Reset Timecheck boxes are the only options checked and nothing else is.Double check everything in the last step to confirm and then hit theSTARTbutton to initiate the official firmware update process of your SGS2.Once the installation is successfully finished, your Samsung Galaxy S2 i777 will reboot automatically and soon you will get aPASSmessage in Odin.Disconnect the smartphone from your computer and enjoy improved performance.