How to Install CM10.1 M3 Android 4.2.2 on AT&T Galaxy S3 SGH-I747 Jelly Bean Custom Firmware

CM10.1 M3 with Android 4.2.2 Jelly Bean is now here for the AT&T Galaxy S3 SGH-I747 Android phone. The first Jelly Bean official update has just been released for this phone a couple of days back, but now you can also enjoy the latest Android 4.2.2 in pure Android stock form on this phone. All the bloatware has been removed and CM10.1 ROMs are always very optimized and bug free usually. If interested in Android 4.2.2 for other phones, check out our new Custom ROMs section.
You can Update AT&T Galaxy S3 SGH-I747 to CM10.1 M3 Android 4.2.2 Jelly Bean custom firmware using the tutorial below. This is not an official release by Samsung, but just a custom ROM which would require a custom recovery like ClockworkMod in order to flash the ROM zip and Google Apps zip files on your phone.
In this tutorial, we will tell you how to install CM10.1 M3 Android 4.2.2 Jelly Bean ROM on AT&T Galaxy S3 SGH-I747 with complete steps using CWM recovery. We also have several tips on how to backup your phone data and also some more tips that you have to keep in mind before proceeding to the tutorial on the next page. You will have to wipe your previous personal data and apps as usual when installing custom ROMs. The following tips are important as they will help the installation procedure to go smooth without any issues. Let’s begin with the tutorial below.

Disclaimer: All the custom ROMs and firmwares, official software updates, tools, mods or anything mentioned in the tutorial belong to their respective owners/developers. We (MyTrickSource) or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial ;-)

CM10.1 M3 Android 4.2.2 Jelly Bean ROM Details:

NOTE: Since this is a nightly build, make sure you know that after installing this firmware update, your Android device can get FC errors, boot loops, several other bugs, apps might not work or worse, your phone might not boot. To fix, you will have to reinstall stock firmware or any other stable custom ROM.

There are tons of useful articles and how-to guides on MyTrickSource for the Samsung Galaxy S3, but we think you might be interested in the following posts:

1. Official Firmware Update for Samsung Galaxy S3 I9300 
2. Update Galaxy S3 I9300 to XXEMC2 Android 4.1.2 Jelly Bean Official Firmware

Like this CM10.1 M3 ROM based on the latest Android 4.2.2? We love it too and we know you are looking forward to install it on your phone now. Now please read below for important tips on how to make sure your installation goes smooth and you do not end up with any problems.

Samsung AT&T Galaxy S3 USB Drivers

You will need to connect your Android phone with the computer. For that, please make sure you have installed the USB drivers for Samsung Galaxy S3 properly. If not, you can download the latest official drivers from our Android USB Drivers section here:
Download Samsung Galaxy S3 USB drivers!

 Backup and Other Important Tips

Done with the USB drivers? Perfect. The tutorial is on the next page, but first, please take a look at the following tips and important points you need to take care of. These are important, as we don’t want anyone losing their personal data or apps:
Always backup your important data that you might need after you install a new custom ROM, an official software update or anything else. Make a backup for just in case, you never know when anything might go wrong. See below for some tips on how to backup data:

• Backup your Apps. How? –> How to Backup Android Apps.  
• Backup your SMS messages. How? –> How to Backup/Restore SMS Messages.
• Backup Call History. How? –> How to Backup Call History.   
• Backup APN Settings: GPRS, 3G, MMS Settings. How? Note down everything from: Settings > Wireless & Networks (More…) > Mobile networks > Access Point Names.   

 Samsung users can also back up data using Samsung KIES. If you backup data manually, you get more options what to choose from and it is very easy to move data across Android devices from different manufacturers, i.e moving Samsung Galaxy Note backup data to HTC One X.

    If you already have a custom recovery (ClockworkMod, TWRP etc.) installed on your phone, we strongly recommend a backup using that as it creates a complete image of your existing phone set up.

 A few more optional tips that you should remember:

        1. Having problems connecting your Android phone to the computer? You need to enable USB debugging mode.

        2. Make sure your Android device is charged up to 80-85% battery level. Why? Because, if your phone goes off suddenly while installing a custom ROM, flashing an official firmware update or installing mods etc. — your phone might get bricked or go dead permanently. No one wants that, right?

        3. Most of the tutorials and how-to guides on MyTrickSource are for factory unlocked Android phones and tablets. We recommend NOT to try our guides if your phone is locked to a carrier, unless we have specified the carrier name or device model.

If you find the above tips useful and they were helpful to you, please consider giving us a +1 or LIKE to thank us!

All set and ready? Good. Now, let’s proceed with the tutorial on the next page and update AT&T Galaxy S3 SGH-I747 to CM10.1 M3 Android 4.2.2 Jelly Bean custom firmware.

HOW TO: Install CM10.1 M3 Android 4.2.2 Jelly Bean on Samsung Galaxy S3 SGH-I747

We have put together a detailed step-by-step instructions guide on how to install CM10.1 M3 Android 4.2.2 Jelly Bean custom firmware on AT&T Galaxy S3 SGH-I747. If you are used to installing custom ROMs on your Samsung Galaxy S3 SGH-I747, then this should not be any different for you.

However, for beginners, you need to root your Samsung AT&T Galaxy S3 and install a custom recovery. Please Google that up if you are unsure and make sure you read the tutorial once before actually performing it on your device.

To Remember:

• This tutorial is only for installing CM10.1 M3 Android 4.2.2 ROM on AT&T Galaxy S3 SGH-I747. Please do not try on any other Galaxy S3 variants.
• Your phone should be rooted and have ClockworkMod recovery installed from before.
• This tutorial will wipe out all your data. Proceed at your own risk.
• Perform a Dalvik Cache wipe before proceeding from the recovery mode.
• Samsung KIES will NOT detect your phone after installing this ROM because it is a custom firmware.
• Make sure you backup all your data in your phone before proceeding.

Complete Step-By-Step Instructions:

Step 1 - Download CM10.1 M3 Android 4.2.2 ROM and Google Apps for Galaxy S3 to your computer.

Step 2 - Connect and mount your Galaxy S3 USB memory on your computer using the USB cable.

Step 3 - Now copy/paste the downloaded Android 4.2.2 ROM zip and Google Apps zip files to your SD card. Make sure the files are in the SD card root (not in any folder).

Step 4 - Then turn OFF your phone and disconnect from the USB cable.

Step 5 - Now to get in the Recovery Mode. Switch ON the phone while pressing and holding Volume Up + Home + Power buttons together. 

Step 6 - Once you are in ClockworkMod Recovery, select perform a full data wipe by selecting “wipe data/factory reset” as shown below. Use the Power button to select everything while in the Recovery Mode.

ROM-Install-CWM-Recovery-1

Step 7 - Then, perform a cache wipe by selecting “wipe cache partition”
ROM-Install-CWM-Recovery-2

Step 8 - Now this is optional, but it is recommended to perform a wipe of your dalvik cache as well. You will not get into boot loops or any other errors. From CWM recovery, go to ‘advanced’ and then select “wipe dalvik cache”.

ROM-Install-CWM-Recovery-3

Step 9 - Then go back to the main recovery screen and select “install zip from SD card”.

Step 10 - Now select “choose zip from sdcard”. Using your volume keys, navigate to the Android 4.2.2 ROM zip file that you copied to your SD card and select it using the Power button. Confirm the installation on the next screen and the installation procedure should start now.

Google Apps: Repeat the above step for the Gapps zip file as well and install it on your phone.

Step 11 - After the installation completes, go to “+++++Go Back+++++” and reboot the phone by selecting “reboot system now” from the recovery menu .

ROM-Install-CWM-Recovery-5

Your AT&T Galaxy S3 SGH-I747 will boot now and it might take about 5 minutes to boot on your first time. So, please wait.


That’s it! Your AT&T Galaxy S3 should now have CM10.1 M3 Android 4.2.2 Jelly Bean custom ROM installed on your phone! Go to Settings > About phone to verify.
Hit +1 or LIKE to thank us!
If you run into any problems, feel free to drop us a comment below and we will reply you back ASAP with the fix or the solution to your problem.