Download and install MIUI Android 4.1.1 Jelly Bean ROM on AT&T Galaxy S3

 

• The process may result in losing all of your data like apps, messages, contacts etc. So first of all take back up of all data to work risk-free.
• Uninstall the antivirus from device (if any).
• Don’t let the power of the device to create any problem for you. So keep your device charged at least 50 percent.
• Install ClockworkMod recovery on your phone.
• Download the zip file of the  ROM here.
• Download GAPPS.zip from here.
• Make sure to save  files on internal SD card of phone.
• Press the VOL DOWN + HOME + POWER buttons to enter into the recovery mode.
• You can scroll through the options by pressing Volume Up and Down button. To make selection of any option, press the Power button.
• Now select the ‘Install Zip From SD Card’ option and choose the .zip file of the ROM from your SD card.
• Select ‘Yes, Install__.zip’  to proceed further with the process.
• The whole process is done. Be patient for the update to get completed. Generally it takes about 2-3 minutes.
• Follow the last three steps to install GAPPS.zip on your AT&T Galaxy S3.
• After the reboot, your AT&T Galaxy S3 will be running on MIUI Android 4.1.1 Jelly Bean ROM.

That’s it. So now start enjoying your AT&T  Galaxy S3 running on MIUI Android 4.1.1 Jelly Bean ROM . The process is very simple and I hope you will follow it properly.