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Cyanogenmod 9 (CM9) for Galaxy S3 i9300 | [Guide] + Video Tutorial

Thanks to incredible group of developers specifically dedicated to Samsung android devices, TeamHacksung, Cyanogenmod 9 custom rom (or CM9 in short) is now available for the Galaxy S3, i9300. And this has been achieved within 3 weeks of the Galaxy S3′s launch, which is impressive, even for the Team, IMHO.
XpLoDWilD, team member of TeamHacksung and recognized developer at xda-forums, shared the CM9 for Galaxy S3 moments ago. So, those of you who were waiting desperately for this, the moment has arrived. And also those who have heard a lotabout it and wanna give it a try, can gladly do so on Galaxy S3. The good thing actually is, even with this being the first nightly build, there aren’t too many and nothing serious at all or kind of deal-breaker bugs here to spoil the mood, especially if you tried the CM7 on Galaxy S when it had just been ported. Btw, CM9 is also available on old devices, the Galaxy S i9000 and theGalaxy S2 i9100.
The only bugs with this first CM9 nightly for Galaxy S3, as of June 17, 2012, are: FM Radio not supported,LED cannot be used in Camera which causes Force Closes on some phones (all other camera things work just fine) and lastly, Wi-Fi connection issues for some, for which there is a working fix too until the bug itself is ironed out completely. So, as I said earlier no deal-breaker bugs with this Galaxy S3 Cyanogenmod 9 build, just go ahead and install it using the instructions set below on the Galaxy S3 i9300 near you. Check out the Known Issues page linked below under Links section just below to get updated list of bugs as the development goes on and new builds come out.
But before we head to instructions, let us share some official links and let’s also give credit to team.


This guide is applicable only for Samsung Galaxy S3 international version GT-i9300 — one with Exynos quad-core processor and 1GB RAM. It is NOT for Galaxy S3 at Verizon, Sprint, AT&T, T-Mobile, US Cellular and any other Canadian Galaxy S3. Check your phone’s version in Settings – About Phone. It has to be “GT-i9300” for this Cyanogenmod 9 rom to be compatible with your phone.


The methods and procedures discussed here are considered risky and you should not attempt anything if you don’t know completely what it is. If any damage occurs to you or your device, we won’t be held liable — you only will be responsible, you’ve been warned!!!

How to Install Cyanogenmod 9 on Galaxy S3 i9300

Here’s the installation guide to install the world-famous and widely adored rom, CM9 on Galaxy S3.
  1. You need clockworkmod (cwm) recovery to be able to install/flash the Cyanogenmod 9 on Galaxy S3. To get that, Install CF-Root, which gets you both root and (cwm) clockworkmod recovery at one shot — easy and simple. Once you have got CF-Root from there, jump to next step.
  2. Download the Cyanogenmod 9 from official development page: Link. (This file will be flashed in step 8 below.)
  3. Download the Google Apps package. This will install apps like Market, Gmail, etc. which are not present in the ROM by default. (This file will be flashed in step 9 below.)
    Download Link  |  Filename: gapps-ics-20120317-signed.zip
  4. Connect phone to PC and transfer the two zip files you downloaded in step 2 and 3 to your Galaxy S3, on the internal sdcard that shows up on PC upon connecting.
  5. Disconnect the phone from PC. And power off the phone, wait till it vibrates and the two capacitive lights (Menu and Back keys) go off, to confirm complete power off.
  6. Now, enter the awesome thing that we call clockworkmod (cwm) recovery. For this, press and hold these 3 buttons together: Volume Up + Home + Power until you see Samsung logo on screen, upon which you can release them all. You’ll enter recovery mode soon enough. (Use volume keys to browse between options in recovery while power key to select to select an option.)
  7. [Optional] It’s recommended you create a backup from the clockworkmod recovery your phone is in right now, using the option Backup and Restore » select backup from internal sdcard. You can restore this backup to get everything to normal in case something turns out bad. You just need cwm recovery for this, which you always get from the link above, in step 1.
  8. Wipe stuff now to prepare for installation of CM9 on Galaxy S3:
    1. Do Wipe Data/Factory Reset — select the option and then select yes on next screen to confirm it.
    2. Do Wipe Cache Partition – select the option and then select yes on next screen to confirm it.
    3. Go to advanced and do Wipe Dalvik Cache — select the option and then select yes on next screen to confirm it.
  9. Flash the Cyanogenmod 9 on Galaxy S3. Now, form the main menu in recovery, select the optioninstall zip from sdcard, then select choose zip from internal sdcard, and then browse to folder location where you transferred the 2 files in step 4 above, then select the CM9 rom file (which you downloaded in step 2 above). Select Yes – Install _____.zip on next screen to start flashing it. Flashing of CM9 rom will be started.
  10. Now, you need to flash the Google Apps too. So, after step 9 is finished and you are back to recovery, go back to the recovery’s main menu. Select the option install zip from sdcard, then selectchoose zip from internal sdcard, and then browse to folder location where you transferred the 2 files in step 4 above, then select the Gapps file (which you downloaded in step 3 above) . Select Yes – Install _____.zip on next screen to start flashing it. Once gapps have been flashed, go back to recovery’s main menu.
  11. Select reboot system now to reboot the phone and boot up into lovely CM9 rom, void of all Samsung bloatware and its TouchWizUX UI (although some may miss it), based on Android 4.0.4 and taste the pure android experience as Google meant it to be.

Video Tutorial

Share your thoughts on the ROM in the comments below. And also let us know if you need any assistance in flashing the CM9 Galaxy S3 rom.

Galaxy S3 CM9 Screenshots

i9300 Galaxy S3 CM9
CM9 Galaxy S3 Rom
Cyanogenmod 9 for Galaxy S3 i9300


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