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Update Samsung Galaxy Nexus I9250 to CM10 Preview Jelly Bean 4.1

CM10 Unofficial Galaxy Nexus I9250 ROM

CyanogenMod 10 is currently in the beta phase and numerous developers are now working on it and now, one of them, Mrc527 who is also an XDA forum member managed to created a working unofficial preview build of CM10 for the Galaxy Nexus I9250 edition. Use the info in this article to learn how to successfully install this new CM10 preview build ROM on your GNex phone.

The CyanogenMod 10 is based on AOSP and it one of the best releases for Android phones and tablets. Also, it is exclusively using Jelly Bean and it might a beta build but it still works smoothly and adds almost all the stock and usual CM customization options and all the other features. To correctly install this ROM, you will first need to read the preparation guide and learn what steps you need to take so that you’ll be covered in case the update bricks the device or files will be corrupted. However, the Galaxy Nexus is a smartphone that can’t be bricked that easily but you still need to use this info just in case something wrong does happen.

Use the info below and learn how to correctly configure your Galaxy Nexus I9250 so that you’ll install CM10 preview ROM Jelly Bean without problems. Here’s what you need to know:

  • use this tutorial only if you want to install it on the Galaxy Nexus I9250 GSM International variant. Do not attempt to install it on any other smartphones or tablets.
  • the tutorial will tell you to wipe data and factory reset the phone, which means that you will lose installed applications and some other files that are stored on your device’s memory. Move all important files on the phone’s Internal SD card as this location and the files comprised within won’t be deleted.
  • since this is a preview build of CM10, you should use ROM Manager or CWM Recovery and create a full backup of the ROM that it is currently installed on your device. This will help you restore it in case the CM10 ROM isn’t working as you would’ve expected it to perform.
  • The Galaxy Nexus I9250 you’re about to update should be on an unlocked bootloader.
  • Your device should be rooted and CWM Recovery has to be installed on it as otherwise you won’t be able to flash this new custom ROM.
  • In order to save the SMS, Call Logs, installed applications and the APN Internet Settings, you should use these Android tools: AppBAK for Android apps backup | SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore.
  • Sync your Phone Contacts with your Gmail account and you won’t lose any saved phone numbers. To restore them you will simply need to add the same Google account when CM10 Jelly Bean finishes the installation.
  • Remember that you need to charge the phone’s battery until it reaches at least 70% charge levels and that will prevent it from powering off while you’re installing the new CM10 preview build files.
  • Enable USB debugging option by going through Settings menu.
  • This CM10 preview ROM is a beta edition and it might have some bugs, which is why you should mainly use it for testing purposes only and if you like how it works then you should keep it. Make sure that you don’t skip any steps and in case you cannot complete the update then you should  ask for help in comments.

I think that this all the general info you needed and now you can move to the tutorial guide. You should read the entire how-to guide before starting to apply its steps, so that you will better familiarize with the steps you have to take.

Install CM10 Preview ROM on Galaxy Nexus I9250 GSM

  1. Download the CM10 preview build ROM HERE. Place it on your desktop and do not unzip the contents. Download the latest ROM file.
  2. Next, download the Google apps package file for Jelly Bean from HERE. Select the file that is for Jelly Bean only. This one will install the Google Now, Play Store, Gmail, Calendar and all other Google-based apps, applications that your devices needs if you wish to benefit from the full Android 4.1.x Jelly bean experience.
  3. Connect your phone to your PC and move the files downloaded on its SD card. After the transfer is complete you should disconnect the phone from PC and then power it off.
  4. Enter CWM Recovery mode or TWRP Recovery. Do it by pressing and holding simultaneously ‘volume up’ + ‘volume down’ + ‘power’ and then you wait until the screen powers ON. When the Recovery mode is loaded you should move to the next step.
  5. Create a full backup by selecting ‘backup and restore’ and then from the new menu select ‘backup for CWM Recovery. Wait until the process is complete and then you will need to flash the new ROM. In case you already have a backup of the existing ROM then you should skip this step.
  6. Next, select ‘wipe data/ factory reset’ and then confirm that you wish to complete this process – CWM Recovery. For TWRP Recovery, select ‘wipe’ and then select ‘factory reset’ and wait for the process to be finished. Return to the main custom recovery menu when you’re done and the data was wiped successfully.
  7. Now select ‘install from sdcard’ and from the next CWM Recovery screen select ‘choose zip from sdcard’ Find the CM10 preview ROM zip and install it. For users of TWRP Recovery, select ‘install’ and then find the ROM zip file and install it using the blue slider button.
  8. When the CM10 Jelly Bean unofficial ROM is installed you will have to repeat step 7 in order to install the Google Apps file, too. Do not flash the ROM twice, just install GApps like in step 7 and then move to the next step.
  9. When the install is complete you should select ‘reboot system’ option from the main custom recovery menu and then wait for your phone to boot normally into CM10 home screen.
  10. The first boot will take at most 10 minutes to complete and you should allow it to load all the files. If the first boot process takes more than that, then the ROM wasn’t installed correctly and you will have to repeat the entire tutorial once again. Now make sure that you apply all the steps that I have listed in the lines above.
  11. When the ROM was installed and phone boots normally, you should start testing CM10 Jelly Bean ROM. That would be all, enjoy your brand new Jelly Bean based CM10 firmware installation.

These are all the steps that I had for you and your Galaxy Nexus should now be running on the CyanogenMod 10 preview build ROM. If you have any other questions or in case you stumbled across other problems, then you should ask for our help by using the comments section that is listed under this article.

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