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Unroot / Restore Samsung Galaxy Nexus I9250 to Stock Android 4.1.2 Jelly Bean

The Samsung Galaxy Nexus I9250 can be unrooted / restored to stock Android 4.1.2 JB using this tutorial. Make sure to read the entire post and you will manage to successfully apply all the actions that I’ve listed below.

The unroot tool has been designed by ‘techfanatic9’, an XDA developer and member. In order to be sure that you successfully unroot your device with this stock ROM, then you should read the preparation guidelines first. It will help you correctly configure your smartphone and your computer, so that you’ll be sure that you flash all files at your first attempt. Restoring the Galaxy Nexus I9250 to stock Android 4.1.2 JB and unrooting it, you will restore the warranty for your device. Also, this guide can be used by users who don’t want to use custom ROMs anymore.

Here’s what you need to know before unrooting the Galaxy Nexus I9250 to Official Android 4.1.2 JB:

  • Use this tutorial only with the Samsung Galaxy Nexus GSM International model number I9250. Do not attempt to use this guide with any other smartphones.
  • Use a Windows PC that has the Android Software Development Kit installed. Download link here.
  • Disable all antivirus applications that are currently open on your computer. Such software will always interfere with the unroot process.
  • Enable USB Debugging option from your phone’s Android Developer Options.
  • Charge the phone’s battery until its power level reaches at least 60%. This will make sure that the phone won’t power off while you’re unrooting it.
  • This is a guide for advanced Android users. Do not blame us in case you brick your phone or you lose any important data in the process.
  • Backup all your important files by moving them to your PC or placing them on to your device’s internal SDcard. The /system partition will be deleted and you will lose installed apps and other system data.
  • IMPORTANT: You should still backup all the data by transferring it to your computer. All the data will be wiped from your device.
  • Sync your Contacts with your Gmail account using this guide here.
  • Read the entire tutorial first and only when you’re sure that you can complete it, you should begin to apply all the actions I’ve listed below.
  • Don’t skip any steps in the tutorial.

These were the guidelines that you had to go over before moving to the tutorial.

If you cannot cannot complete the unroot, then you should ask for more help in comments.

How to Unroot Samsung Galaxy Nexus I9250 to Stock Android 4.1.2 Jelly Bean:

  1. Download the Galaxy Nexus Unroot zip file from HERE. Save the zip on your PC and then extract its contents where the Fastboot folder is located. NOTE: You can find it in the Android SDK/ Platform Tools directory. After you’ve extracted the zip contents you should get to the next step.
  2. Power off your smartphone.
  3. Boot it into Fastboot Mode by pressing Volume Up, Volume Down and Power buttons, all at the same time. When the display powers ON you should release the buttons.
  4. Now, connect your smartphone to your PC using the USB cable.
  5. Go to the ‘Fastboot’ folder where you’ve place the ‘unrooting’ extracted files. Press SHIFT key and at the same time right-click the folder’s white space. Select ‘open command window here’ from the context menu. The Windows Command Prompt launches and you have to continue the unroot.
  6. Enter the following command to see if your phone has been recognized by the PC: fastboot devices
  7. Next, enter the following command lines in order to unroot the device:
    fastboot flash bootloader bootloader-maguro-primelc03.img
    > fastboot reboot-bootloader
    > fastboot flash radio radio-maguro-i9250xxlf1.img
    > fastboot reboot-bootloader
    > fastboot -w update image-yakju-jzo54k.zip
  8. The Galaxy Nexus will restart now and you should be presented with the Android 4.1.2 Welcome Screen.
  9. Setup the device and take control over it. These were all the steps you had to take in order to unroot your device.

NOTE: If you want to relock the bootloader also, then you have to follow the steps below:

  1. Power off the Galaxy Nexus.
  2. Boot it into Fastboot mode.
  3. Connect it to your computer using the USB cable.
  4. Now, launch again a Command Prompt window on your PC, just like you did at step 5 of the above guide.
  5. Enter this command to see that the phone has been recognized by the PC: fastboot devices
  6. In order to re-lock the Bootloader of your Galaxy Nexus enter this: fastboot oem lock
  7. That’s it, you’ve managed to re-lock its bootloader and you’re done with this tutorial.

If you cannot complete these guides, then you should ask for more help in comments.

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