Download and Install AT&T Galaxy S3 SGH-i747 CyanogenMod 9 (CM9)

The Android platform is open source – it was made to be tinkered with, optimized, and redistributed freely. As we know rooting (You can refer tutorial here to root your galaxy s3 with only few simple step) is what allows users to easily replace the smartphone’s stock firmware with a different one.  Ever since the process was discovered, developers have been making their own custom ROMs and distributing them throughout the Android community. If you have been around the android community for a while, you most likely will have heard of CM or Cyanogen (Mod).
CyanogenMod is a customized, aftermarket firmware distribution for select Android devices. Intended as a replacement for the firmware that comes factory installed on your smartphone, CyanogenMod is based on the Android Open Source Project – the same base software used in all Android devices. However, CyanogenMod offers several benefits over the pre-installed firmware, including vastly flexible interface and customization, a wider set of new features, and sometimes significant improvements in performance. So, the benefit of using the CM roms is all the manufacturers ‘bloat ware’ is removed, think of it as a stripped back, faster version of android, the kind installed on the Nexus range of Google phones.
Thanks info from XDA Member – ChaosMinionX, the test version of CM9 ROM nightlies have been released for AT&T Galaxy S3 . Here is the CM9 ROM nightlies download link and Tutorial on how to install CM9 ROM nightlies for Galaxy S3 SGH-i747:
Please note that this CM9 ROM nightlies for Galaxy S3 SGH-i747 still in testing stage and not good for daily use. The knowing isuues as below:
- Cannot receive phone calls
- USB functions not working
- Camera Touch Focus is misbehaving; don’t use it for now.
- Voicemail Issues
- Camera Storage Point Issues
Tutorial on how to install CM9 ROM nightlies for Galaxy S3 SGH-i747:

Download cm-9-20120712-NIGHTLY-d2att.zip : Link

 Download gapps-ics-20120429-signed.zip: Link

Before start, Refer here on how to root and Install SWM Recovery for AT & T Galaxy S3: Link
Step 1:Copy and paste the downloaded “cm-9-20120712-NIGHTLY-d2att.zip”  and “gapps-ics-20120429-signed.zip”  into Galaxy S3 external SD card storage.
Step 2:Power Off your Galaxy S3.
Step 3: Press Volume Up + Home Button + Power Button until your Phones boot into CWM Recovery Mode. ( This step is almost same to boot your S3 into Downloading Mode, refer here for more info)
Step 4: Select wipe data/factory reset, then select Yes. (Note: this step will delete your Galaxy S3 data, so you can refer hereon how to backup Galaxy S3 data).
Step 5:Press volume down until option “Install Zip From SdCard”, then press Power button to select “Install Zip From SdCard” .
Step 6:Now chose “ Choose zip from SDCard”
Step 7:Press volume down and then Power button to choose “cm-9-20120712-NIGHTLY-d2att.zip”
Step 8:Press volume down and then Power button to choose “Yes- cm-9-20120712-NIGHTLY-d2att.zip”.
Step 9:Now is the process install cm-9-20120712-NIGHTLY-d2att.zip.
Step 10:Now install Google Apps. Press volume down until option “Install Zip From SdCard”, then press Power button to select “Install Zip From SdCard” . Now chose “ Choose zip from SDCard”. Press volume down and then Power button to choose “gapps-ics-20120429-signed.zip”. Press volume down and then Power button to choose “Yes-install gapps-ics-20120429-signed.zip”.
Reboot your S3 after installation complete. That’s All!

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