Update Samsung Galaxy S2 I9100G to CM9 RC1 Official ROM Firmware

Galaxy S2 I9100G CM9 RC1 ROM Update

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Samsung Galaxy S2 I9100G is available on Asian markets and on some regions in Europe and now it has received an official update by CyanogenMod team, update that will allow you to successfully upgrade your device to the CM9 Release Candidate 1 ROM firmware. This post will help you install and flash Cyanogen’s latest Android 4.0.4 ICS update, installation that will help you improve the overall performances of your device.

The CyanogenMod team finished its work on CM9 and now they’ve released an official Release Candidate 1 version for their ‘built-from-scratch’ ROM especially designed for Galaxy S2 devices. In this article you will find all the instructions you need in order to successfully apply the update on your smartphone. Make sure that you read the preparation guide before moving to the tutorial, so that you’ll learn how to properly configure your I9100G device and install the update at your first attempt. Here’s what you need to know:

  • apply the CM9 RC1 update only on Galaxy S2 I9100G smartphones. Do not attempt to flash it on I9100 nor or any other Android devices as that might result in a failed installation or you might end up bricking that other phone.
  • enable USB debugging on your phone.
  • charge the phone’s battery so that it won’t discharge during the updating process.
  • the tutorial guide features a step that tells you to wipe all phone data and, this means that you will need to backup all important phone data. Move the files you wish to save on your device’s internal / external sdcard.
  • if you wish to save installed applications, SMS, Call logs and the APN Settings use the following Android apps: AppBAK for Android apps backups | SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore.
  • Sync your Contacts with the Gmail account you’ve set for your I9100G device. Here’s a guide that you can use to learn how to backup the phone  numbers stored on your phone.
  • create a full Nandroid backup of the ROM currently installed on your phone. This step is required just in case you won’t like how the CM9 RC1 update is performing on your device.
  • note that we cannot be held responsible in case something goes wrong after the update and you should know that this update is installed at your own risk.
  • only advanced Android users should try to update their devices using the CM9 RC1 or, in case you have a friend that know more about Android then you should ask him to flash this new ROM.
  • apply this update only on SGS2 I9100G device that are rooted and have the CWM Recovery installed.

Now that you know all of the above you should move to the tutorial guide and learn how to successfully apply the CM9 Release Candidate 1 ROM on your Galaxy S3 I9100G phone. In case you can’t understand some of the steps you need to take, then you should use the comments field and ask for help and we will try to help you flash all the necessary files in order to install the CyanogenMod 9 RC1 update on your phone.

How to install CM9 Android 4.0.4 RC1 ROM on Galaxy S2 I9100G:

  1. Download the CM9 RC1 for SGS2 zip file from here and save the file on your computer.
  2. Download the latest Gapps zip file. Follow this post and get the latest Gapps file for CM9.
  3. Next, connect your device to your PC.
  4. Transfer both ROM zip files on your phone’s internal sdcard.
  5. Power OFF the I9100G device after the transfer is complete.
  6. Boot it into CWM Recovery by holding simultaneously the ‘volume up’ + ‘home’ + ‘power’ buttons. Hold them pressed until CWM Recovery screen loads.
  7. When in recovery mode you need to select ‘wipe data/ factory reset’ and confirm this process.,
  8. Now, select ‘install zip from sdcard’ and then ‘choose zip from sdcard’. Find the CM9 RC1 rom zip file transferred at step 4 and confirm its installation.
  9. Repeat step 8 only that now you need to flash the ‘gapps’ zip file. After the installation you need to get to the next step.
  10. Return to the main recovery menu and select ‘reboot system now’.
  11. Wait until your Galaxy S2 I9100G smartphone completes its first boot with CM9 RC1 ROM. Please note that this might take over 10 minutes and the only thing you can do is to wait until the first boot process completes.
  12. When the new home screen loads, you need to enter your Google account and that’s the last you need to do. Now your phone has been updated to the Release Candidate 1 version of CyanogenMod 9 ROM.

Please note that in case the first boot takes over twenty minutes to complete, it means that something went wrong and now you’re forced to repeat the entire tutorial once again. This time make sure that you wipe data and only after that step you should flash the ROM update. If you have any extra questions please post them in our comments field and I will try to help you flash this update.

Remember that you can update your Galaxy S2 device only if you have your phone rooted and CWM Recovery installed, because otherwise you won’t be able to get past step 1. The CyanogenMod team recently managed to create a release for the Release Candidate version of CM9 and in the near future we should get a final update for it. Return to our website and you will surely find an update for Galaxy S2 I9100G phone here.

In case you found this post by mistake and you were instead searching the web for the Galaxy S2 I9100 model number, then you should use the search function of our website and I’m sure that you will find a guide that helps you flash a brand new custom ROM firmware. In case you have any extra questions or, if you have some new tips and tricks regarding the Galaxy S2 I9100G then you should our comments section and post them there.

This tutorial guide was only destined to be used on I9100G device, which means that no other device is supported by it.

  • Andreas Grunwald

    Läuft echt gut!!!
    Bisher ist mir nur ein BUG in der Camera-App aufgefallen. Beim Fotografieren wird die Aufnahme-Zeit nicht mehr gespeichert. Ein Menüpunkt zum aktivieren der Aufnahmezeit fehlt.

  • isuru

    worked.though had to download certain soft from the andriod market like file manager,players,FM radio etc.