How to Unroot/Install Jelly Bean 4.1.2 on Galaxy Nexus GSM! [Windows]

Click here for Mac version.

This guide will install the official Jelly Bean 4.1.2 on Galaxy Nexus GSM i9250 and also unroot your phone. Yes, after using this method you can send it back to the manufacture/carrier.

Note! This will delete everything on your phone. Backup your phone!

1. 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.

2. Plug in your phone via microUSB.

3. Download and extract Galaxy Nexus GSM Unroot.Stock 4.1.2 Windows.zip below.
Download Galaxy Nexus GSM Unroot.Stock 4.1.2 Windows

4. Move the folder to your desktop.

5. Open Command Prompt and type:
cd Desktop
cd Galaxy Nexus GSM Unroot.Stock 4.1.2 Windows
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

6. Your phone will now reboot and your are now on the full official Jelly Bean 4.1.2.

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

7. 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.