Nexus phones and devices are popular not only for their pure Android interface but also for their wide range of software development and support. In fact, even after a year and more, the Samsung Galaxy Nexus GT-I9250 is still considerably popular in Android development forums. Of course, with its wide array of support, Galaxy Nexus users are easily drawn towards customizing their phones by flashing ROMs, kernels, or mods. Chances are, some users have regretted their decision to flash ROMs or probably just want to have their phones fixed with the added warranty. If you're looking to return your Galaxy Nexus phone to its original state, this guide will be useful to you.

XDA Developers member techfanatic9 has shared his guide on how to unroot the Galaxy Nexus GSM and return it to its pure Android glory. Simply follow the steps below to get started.

This guide shows you how to unroot the Galaxy Nexus I9250.

Warning

• The instructions in this guide are intended for use with the Samsung Google Nexus, model number GT-I9250. Applying these instructions on another device or model may produce undesired outcomes.
• The information in this guide is provided for instructional and educational purposes only. There is no guarantee that these instructions will work under your specific and unique circumstances.
• Use these instructions at your own risk. We shall not hold any responsibility or liability for whatever happens to you or your device arising from your use of the info in this guide.
• Read and understand the whole guide first before actually performing the instructions.

Requirements

• Samsung Galaxy Nexus GT-I9250
• A Windows PC
• Android Software Development Kit installed and Android Debug Bridge setup on your computer.
  • Here are our guides on how to install the Android Software Development Kit and how to setup Android Debug Bridge on your computer.
• Download the Galaxy Nexus GSM Unroot to Stock 4.1.2 package (Galaxy Nexus GSM Unroot.Stock 4.1.2 Windows.zip, md5sum: c740771a4def5b4e6aff1404c49e151e)
• Make sure your device's battery still has at least 70% power. You don't want the device to shut down in the middle of the procedure.
• Backup all personal data on your phone to make sure you have a copy of your personal data (e.g., contacts, SMS, MMS, Internet settings, Wi-Fi passwords, and the like) in case the procedure in this guide erases such data.
  • For backup tips, check our guides on how to sync your data to the cloud and how to create local backups of your mobile data.

Instructions

1. Extract the Galaxy Nexus GSM Unroot.Stock 4.1.2 Windows.zip file and save the files in the same folder as your Fastboot files.
   • For example: C:\Windows\Program Files\Android SDK\Platform Tools
2. Turn your phone off.
3. Boot your phone into Fastboot Mode by holding down the Volume Up, Volume Down, and Power buttons until your phone's screen turns on.
4. Connect your phone to the computer via USB cable.
5. On your computer, open a command prompt with Administrator's privileges.
6. At the command prompt, navigate to the directory or folder where your Fastboot binary and extracted ZIP files have been saved.
7. Check if your computer recognizes your phone. Your phone's serial number should appear on the command prompt window after you enter the following command:
   • fastboot devices
8. Enter the following commands:
   • 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
9. Your phone will reboot and you will be greeted by your phone's setup wizard.
10. If you want to proceed with relocking your phone's bootloader, continue with the next steps.
11. Turn your phone off.
12. Boot your phone into Fastboot Mode by holding down the Volume Up, Volume Down, and Power buttons until your phone's screen turns on.
13. Connect your phone to the computer via USB cable.
14. On your computer, open a command prompt with Administrator's privileges.
15. At the command prompt, navigate to the directory or folder where your Fastboot binary and extracted ZIP files have been saved.
16. Check if your computer recognizes your phone. Your phone's serial number should appear on the command prompt window after you type the following command:
    • fastboot devices
17. Type the following commands to relock your phone's bootloader:
    • fastboot oem lock

Congratulations! You have unrooted your Samsung Galaxy Nexus GT-I9250 and relocked its bootloader.