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Update Samsung Galaxy Nexus ‘takju’ to Official Android 4.2.1 JOP40D Firmware

After the Google Nexus 10, Nexus 4 and the Nexus 7, the Galaxy Nexus has also received the latest Android 4.2.1 JOP40D Firmware. This tutorial will teach you how to flash the new update ROM on your smartphone. Read all the info I’ve posted and you should be able to flash the JOP40D firmware in no time.

This update can be installed manually on those Nexus phones that did not receive the OTA update notification. It is a manual update method and it can be installed on the Samsung Galaxy Nexus that has been purchased from Google’s US Play Store. This device is also codenamed ‘takju’, while the other International variant of Galaxy Nexus is ‘yakju’. The same phones but with different factory images, so you should apply the OTA update only if your device is from the Play Store.

The Android 4.2.1 measures only 1.1MB in size and it brings only a couple of fixes, such as the December bug being removed and some other functions have been improved so that you’ll get a better performance out of your Galaxy Nexus device. If you want to update your phone, then you should first read the pre-requisites guide below:

  • This is a guide that will work only for the Samsung Galaxy Nexus device that has been purchased from the Google US Play Store. It is also known as ‘Takju’ and this info can be checked by opening the Settings menu and then you should find what you need in the ‘About phone’ section.
  • Install the Samsung USB drivers for your smartphone on your PC. These will make the Galaxy Nexus visible to your computer.
  • The Galaxy Nexus should be on a stock firmware and it shouldn’t be rooted. Also, no other customizations should be installed on your ROM.
  • If you’re running a custom Recovery such as TWRP or CWM, then you can simply install the update using the recovery mode. Copy the firmware zip to the phone’s internal SDcard and flash it just like you would do with a custom ROM.
  • Backup your important files before installing the firmware update.
  • Enable USB debugging option from the development menu.
  • Make sure that your device’s battery is fully charged. This will prevent it from powering off during the installation.
  • The antivirus apps should be disabled on your PC so that it won’t block the tools you’ll use to update the phone ROM.
  • We cannot be held responsible in case your device is bricked in the process. You’re installing the update at your own risk, which is why you should backup every single file from your PC.
  • Don’t skip any steps listed in the tutorial. If you cannot complete the update or you can’t understand some of the steps you’re about to take, then you should ask for extra help in comments.

Now that you know all of the above, I think that you can continue to the tutorial and apply the firmware update.

How to Update Galaxy Nexus ‘takju’ to Official Android 4.2.1 JOP40D Firmware:

  1. Download JOP40D OTA Update file from HERE.
  2. Get the Fastboot zip file from HERE. This is the program you’ll use in order to add the adb files to your computer and to flash the update.
  3. Extract the Fastboot zip contents and save them to a folder that has the same name. Place the folder on your PC desktop screen.
  4. Move the Android 4.2.1 JOP40D firmware zip to the Fastboot folder.
  5. Power off the Galaxy Nexus.
  6. Boot the phone into Bootloader Mode by pressing at the same time ‘volume up’, ‘volume down’ and ‘power’ buttons. When the screen powers ON, a START text will appear and you need to change it to show ‘Recovery’. Select this option and then the device will boot into Stock Recovery mode.
  7. A red exclamation point will show and an Android will be shown in the new screen. Press ‘Power’ and at the same time press Volume Up for the Stock Recovery menu to be visible.
  8. Now you have to connect your Galaxy Nexus to your computer. The drivers will now install on the PC and after that you should move to the next step.
  9. Go to ‘Fastboot’ folder and hold Shift key, while at the same time you right-click onto the folder’s white space. Select ‘open command window here’ from the right-click context menu. Command Prompt window will show up.
  10. Enter the following command in the Command Prompt and the update will be flashed when you finish the steps:
    • adb devices – this is the command that will show up the device ID of your Galaxy Nexus phone. If no device shows up, then the drivers for the phone were not installed and you should re-install the usb drivers.
    • adb sideload 1d62212ba0a9.signed-takju-JOP40D-from-JOP40C.1d62212b.zip – this will show the ‘sending: sideload’ alert and when this gets to 100%, the update of the JOP40C firmware will begin.
  11. When the installation is complete you should select the ‘reboot system now’ option from the Stock Recovery menu.
  12. Now your Galaxy Nexus boots into normal Android 4.2.1 JOP40D Firmware home screen.

Test the new ROM and tell us in comments if you like it. In case you have problems installing it, then you should leave a detailed comment at the end of this post and we will help you complete the tutorial.

These were all the instructions that you had to follow and now you should begin to test the ROM. Remember that this is an official Android 4.2.1 stock firmware ROM and it isn’t rooted. For a root tutorial, you will have to wait a while until a developer/ modder will create a working tool.

Keep an eye on our website as we will try to post all the new firmware update for Galaxy Nexus immediately as they appear. Also, remember that this Android 4.2.1 JOP40D OTA Update should be launched for the ‘yakju’ International variant of Galaxy Nexus, too, and when that happens we will post a tutorial for you to use and learn how to install it successfully.

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