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Update Samsung Galaxy Nexus GSM to Android 4.2.2 Jelly Bean using CM 10.1 RC2 ROM

The Samsung Galaxy Nexus device can be updated to the latest Android 4.2.2 Jelly Bean using the CM 10.1 Release Candidate 2 build. This is the latest CM build release a few days ago and you can easily learn how to install it with this tutorial.

In order to successfully flash this custom ROM for your Galaxy Nexus, you will first have to read the preparation info below. Here’s what you need to know:

  • use this post only with the GSM variant of the Samsung Galaxy Nexus phone. Don’t try to update any other Android device using the files I’ve listed in this post, as you will end up bricking it.
  • your device has to be bootloader unlocked, rooted and running a custom Recovery image such as TWRP or CWM. I used the ClockworkMod Recovery for this tutorial, but you can use the TWRP one if that’s the variant installed on your smartphone.
  • use the same custom Recovery mode to create a full NANDROID backup of your current OS and set a restore point for your device. Restore point that can be used in case your phone doesn’t boot with the CM 10.1 RC2 ROM.
  • backup Call LOgs info, SMS and APN Internet Settings using the following applications for Android:  SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Root access is needed for some of these applications, as otherwise you cannot launch them on your PC.
  • since the tutorial will ask you to ‘factory reset’ the phone before installing the new ROM, you will need to backup some of your most important apps that are stored on the system partition. The internal SDcard will not be wiped by this guide, which is why all the data stored on it doesn’t have to be backed up.
  • make sure to sync your Contacts data with your Gmail account before the CM 10.1 installation.
  • enable USB debugging option from the Developer Options menu.
  • make sure that there is enough power left in the phone’s battery, as you wouldn’t want the phone to switch off in the middle of the updating process.
  • this guide is for advanced Android users.
  • don’t skip any steps listed below and first you should the entire post before starting the update.
  • if you cannot complete the upgrade to the latest CM 10.1 RC2 ROM, ask for extra help in comments.

NOTE: in case your phone is already sporting a CM 10.1 build, then you can skip the ‘factory reset’ action. This is known as a ‘dirty flash’. But, in case the phone doesn’t boot with the new ROM and you didn’t apply the ‘factory reset’, then you will be forced to repeat the entire tutorial and apply the factory reset action.

Now that you’ve read all of the above, continue to the next part of this post.

How to install CM 10.1 RC2 Android 4.2.2 Jelly Bean ROM for the GSM Samsung Galaxy Nexus:

  1. Download the CM10.1.0 RC2 build ROM from HERE. Don’t extract the contents of the zip and save the file on your PC.
  2. Download the Gapps for Android 4.2.2-based ROMs from this link HERE. Don’t unzip and place the file on your PC.
  3. Connect the Galaxy Nexus device with your computer using the USB cable. Now, move both zip file onto its internal SDcard.
  4. Disconnect phone from PC and then power it off.
  5. Boot your device into Fasboot / bootloader mode now. To do it you will need to press and hold Volume Up, Volume Down and Power buttons, all at the same time.
  6. Select ‘RECOVERY’ option from the Fastboot menu. Wait for the CWM Recovery mode to load all its necessary files.
  7. Select ‘backup and restore’ option and create a full NANDROID backup of your current ROM. This is the step that sets a restore point for the phone.
  8. Select ‘wipe data/ factory reset’ option and confirm. NOTE: if the Galaxy Nexus already runs on a previous CM 10.1 build, then you can skip this step.
  9. Select ‘install zip from sdcard’ now and from the new menu select ‘choose zip from sdcard’. Find the CM 10.1.0 RC2 zip and confirm its installation.
  10. Next, after the ROM is installed, select ‘choose zip from sdcard’ option again. This time you need to browse the phone for the Gapps file. Confirm the install process.
  11. Return to the main recovery menu when the files are installed with success.
  12. Select ‘reboot system now’ and wait several minutes until the new OS loads all of its files.
  13. After the first boot process is complete, you will have to enter your Google Account details and take control over your device once again.
  14. Test all of its features and then tell us in comments which are your favorite new things that were installed by the CM 10.1.0 RC2 ROM.

If the first boot process doesn’t complete, then you should power off the device. Repeat the entire tutorial and make sure that you don’t skip any steps that I’ve listed above. Make sure to apply step 8, as that might be the reason for the failed installation attempt.

In case you have any other problems installing CM 10.1 Release Candidate 2 ROM on your Galaxy Nexus GSM phone, then you should ask for extra help in comments.

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