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Flash CyanogenMod 10.1.2 Stable ROM based on Android 4.2.2 for Samsung Galaxy Nexus GSM

CyanogenMod 10.1.2 Stable ROM is now live and you can install it on your Samsung Galaxy Nexus GSM variant. You can use this tutorial in order to learn how to successfully update your device with this latest CM 10.1.2 Stable ROM. Read the entire post and make sure that you don’t skip any steps in the process.

In order to make sure that you successfully update your device then you have to take a look at the preparation guide below:

  • This tutorial should be used only with the Samsung Galaxy Nexus I9250 device.
  • Do not attempt to update any other devices using the instructions that I have listed here as you will end up bricking it.
  • Your Galaxy Nexus GSM has to be factory unlocked, rooted and the CWM or TWRP recovery should be installed on it.
  • The tutorial will ask you to ‘factory reset’ the device, which is why you need to know that all contents stored on your device’s system partition will be deleted in the process.
  • The internal SDcard won’t be affected by the factory reset.
  • If you want to backup installed apps data, then you can use Titanium Backup or the Helyum app from Google Play Store.
  • In order to backup SMS, call logs info or APN Internet Settings, then you should use the following tools for Android: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. You will have to grant root access for some of these tools.
  • Make sure to sync your Gmail account with the Contacts data so that you will not lose any saved phone numbers.
  • Enable USB debugging from Developer Options.
  • Read the entire post and don’t skip any steps.
  • Check the phone’s battery power levels before starting the update and make sure that it has at least 50% remaining before shutting down. If the phone powers off in the middle of the updating process, then you will have to repeat the entire tutorial once again.
  • Note that we cannot be blamed in case something goes wrong and you brick the device or you lose any important files in the process. This is a guide that should be applied by advanced Android users.

All the guidelines that you had to go over before starting the update are listed above and, now you can continue to the next part of this article. Learn how to install a CyanogenMod build for your Nexus smartphone.

How to update Samsung Galaxy Nexus I9250 to Android 4.2.2 via CM 10.1.2 Stable ROM:

  1. Download the CM 10.1.2 Stable zip from here.
  2. Download Gapps for Android 4.2.2 / CM 10.1.x ROMs from here.
  3. Connect the smartphone with your PC and then move both zip files to its internal SD card.
    > do not unzip the files.
  4. After the files are copied you have to disconnect the device from PC and then power it off.
  5. Boot your smartphone into Bootloader Mode, then select Recovery Mode and wait for CWM / TWRP screen to appear.
  6. When you’re at the main Custom Recovery screen you will first need to create a NANDROID backup of your current ROM:
    > for CWM Recovery: select ‘backup and restore’ option. Confirm.
    > for TWRP Recovery: press Backup, select the system files and confirm the process.
  7. Now you can apply ‘factory reset’:
    > for CWM Recovery: select the option that says ‘wipe data/ factory reset’. Confirm.
    > for TWRP Recovery: press the Wipe button, then Factory Reset. Confirm.
    – in case your device already runs a previous build of CM 10.1.x, then you might want to skip this step.
    NOTE: in case the device doesn’t boot with the CM 10.1.2 Stable you will have to return to Recovery Mode and apply ‘factory reset’.
  8. Next, install the custom ROM files:
    > CWM Recovery: select ‘install zip from sdcard’, then ‘choose zip from SDcard’. Find the CM 10.1.2 zip and install it.
    > TWRP Recovery: press the Install button, then browse your device’s internal SDcard and load the CM 10.1.2 zip. Confirm the installation by sliding the blue button shown at the bottom of the screen.
    > wait several minutes for all files to be flashed successfully.
  9. When the CM 10.1.2 ROM is installed, repeat the step 8 and flash the Gapps file.
  10. After both files have been installed, then you should return to the main Recovery screen.
  11. Reboot your device by selecting ‘reboot system now’ for CWM or ‘Reboot > System’ for TWRP.
    > now the phone will start the first boot process of the new OS and you should wait until all CM 10.1.2 ROM are loaded with success.
  12. Enter your Google Account details when the ROM’s home screen appears.
  13. Test all the CyanogenMod 10.1.2 features and start customizing the Galaxy Nexus screens.

These were the steps you had to take in order to flash all CM 10.1.2 Stable and Android 4.2.2 files. If you cannot complete the installation at your first attempt and you got stuck, then you should power off the device, boot again in Recovery Mode and repeat the entire tutorial. Make sure to apply ‘factory reset’, as that might why you cannot complete the tutorial.

In case you don’t like how your Galaxy Nexus works with the new CM 10.1.2 ROM, then you can easily restore the device to its previous ROM using the NANDROID backup file created in step 6. In case you have any other questions, then you should ask for more help in comments.

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