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How to: Unroot the Galaxy Nexus, Re-lock the Bootloader and Return to a Factory State

Unlocking the bootloader and rooting your Galaxy Nexus is really only half the battle. There may come a time when you need need to lock everything back up, including that bootloader. Thanks to the Android team, we have the factory images that can not only fix a bootlooping or soft-bricked device, but make it look like you just pulled it out of the box.  

Instructions:

*Note – These instructions will work for any Nexus device, you just need to swap out files and filenames in the command lines.

1.  Download the newest factory images to your PC.

[Download (4.0.2)]  [Download (4.0.4)] [Download (4.1.1)]

2.  Unzip the file and its contents into your SDK/Tools folder (wherever your adb.exe and fastboot.exe files are).

*Make sure they are not in their own folder, but have all been extracted to Tools.

3.  From within your Tools folder, open a command prompt (SHIFT + right click – “open command prompt here”):
4.  Type the following commands, allowing each to finish before moving onto the next:

*If flashing 4.0.4 or newer files, you will want to swap out to matching file names in the commands below.

adb reboot bootloader
fastboot flash bootloader bootloader-toro-primekk15.img
fastboot reboot-bootloader
fastboot flash radio radio-toro-i515.ek02.img
fastboot reboot-bootloader
fastboot flash radio-cdma radio-cdma-toro-i515.ek05.img
fastboot reboot-bootloader
fastboot -w update image-mysid-icl53f.zip
fastboot reboot-bootloader
fastboot oem lock

5.  Reboot your phone by highlighting “Start” and pressing the lock switch.
6.  It really is as simple as that. Your phone is now back to a 100% stock, unrooted and locked state.