How to Unroot/Install Stock 4.2 Jelly Bean for Galaxy Nexus GSM on Windows!


Got a Mac? Click here

This guide will install the official 4.2 Jelly Bean on Galaxy Nexus GSM i9250 and also unroot your phone. Yes, after using this method you can send it back to the manufacture/carrier. 

Update: 11/18/12 - I updated the download link so you shouldn't getting the "Unsupported 16-Bit Application" anymore.
Update: 11/19/12 - I updated the download link again because people were still having problems with the "fastboot.exe" file. 

This will delete everything on your phone. BACKUP your phone! 


1. Power off your Galaxy Nexus.



2. Enter your phone into bootloader mode. Hold the volume up, volume down, and power button all at the same time. Once you feel a vibration let go of the power, but keep holding onto the volume up and down button. 



3. You will now see a green start screen, shown below.



4. Plug in your phone via microUSB. 



5. Download and extract Install.Unroot.GalaxyNexusGSM.4.2.zip below. 


Download Install.Unroot.GalaxyNexusGSM.4.2.zip


6. Move the folder to your desktop.



7. Open Command Prompt and type: 

cd Desktop 
cd Install.Unroot.GalaxyNexusGSM.4.2
fastboot flash bootloader bootloader-maguro-primelc03.img
fastboot reboot-bootloader
fastboot flash radio radio-maguro-i9250xxlh1.img
fastboot reboot-bootloader
fastboot -w update image-takju-jop40c.zip



8. Your phone will now reboot and your are now on the full official Jelly Bean 4.2.



Only continue if you are going to send to back to your carrier or manufacture.


9. Now we are going to lock the bootloader. Enter your phone into bootloader mode. Hold the volume up, volume down, and power button all at the same time. Once you feel a vibration let go of the power, but keep holding onto the volume up and down button. 



10. In Command Prompt type: fastboot oem lock 



11. Reboot your phone using the power button and you are now on 100% stock and it is safe to send back to the manufacture or your carrier. 

Credits - Google
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