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Update Google Nexus 7 WiFi / 3G to Official Android 4.2.1 JOP40D Firmware

Android 4.2.1 is now ready to be installed on the Nexus 7 WiFi and 3G tablets and you can use this tutorial to learn how to successfully flash it. It is an OTA firmware update with the JOP40D version and it comes with several improvements and bug fixes.

Multiple users of Nexus 7 around the world reported that this update has been pushed via OTA notifications. This is a guide that is destined to be used by those of you who didn’t receive the update notification. It is a manual update guide and it will help you flash Google’s latest Android 4.2.1 Jelly Bean firmware.

This is an update that fixes the December Bug, which made the December month invisible to the People application, it brings support for HID gamepads and joysticks via Bluetooth, several bugs were fixed and maybe some other improvements were added to the overall UI. In order to correctly update your device, you will have to read the preparation guide below.

Here’s what you need to know before moving to the ‘how-to’ guide:

  • This tutorial is only for the Google Nexus 7 tablets WiFi and 3G variants. Do not attempt to flash the JOP40D OTA update files on any other Android device.
  • Your Nexus 7 should be running the stock Android 4.2 JOP40C firmware. The new firmware build cannot be flashed on a different firmware and it can’t be installed over custom ROMs nor on device that are running custom recovery files.
  • The Nexus 7 shouldn’t be rooted because the JOP40D firmware is stock and has to be flashed on a device that runs stock ROM.
  • Install the Android SDK from HERE. Without this, you cannot flash the new OTA update. This file will install the adb drivers that your PC needs in order to recognize the Nexus 7 tablet.
  • Enable USB debugging option.
  • The tablet’s battery indicator should be over 50%. It will prevent it from powering off during the installation of this new ROM.
  • This is a guide for advanced Android users and you should only flash it before you create backups of your most important files.
  • We cannot be blamed in case something goes wrong and you cannot use your device after the OTA update. However, if your device is on Stock JOP40C ROM then you shouldn’t experience any problems after updating to JOP40D Android 4.2.1 firmware.
  • Read the entire guide and don’t skip any of the steps I’ve listed. For more information or for extra guidance, use the comments field and leave a detailed post containing all the steps you took and what firmware you’re currently using on your Nexus 7.

These were all the guidelines you had read before getting to the tutorial. Start the update only after you’ve all of the above instructions.

How to flash Android 4.2.1 JOP40D Jelly Bean OTA update on Google Nexus 7 WiFi / 3G:

  1. Download the JOP40D OTA Update zip file from the links below. Get the file that corresponds to your tablet.
    • Google Nexus 7 WiFi firmware.
    • Google Nexus 7 3G Firmware.
  2. Get Fastboot zip from HERE. This is the file that contains the adb files which will help you flash the OTA update file.
  3. After Fastboot is downloaded, extract its zip contents and place them on your desktop in a folder named Fastboot.
  4. Next, copy the OTA update file you downloaded at step 1 into the Fastboot folder.
  5. Power off your Nexus 7 tablet completely.
  6. Boot it into Bootloader Mode by pressing at the same time ‘volume down’ and ‘power’ buttons. When the display powers ON you should see the ‘START’ text and then you need to use the volume keys to change it and select ‘Recovery Mode’. Press power to boot the stock RECOVERY mode.
  7. Now a red exclamation point and an Android will appear. You need to press and hold Power and at the same time press Volume Up for the stock recovery menu to load.
  8. Choose the option that say ‘apply update from adb option’ from the recovery menu.
  9. Connect your Nexus 7 to your PC using the USB cable. When the drivers are installed you should get to the next step.
  10. Go to the ‘Fastboot’ folder you created at step 3. Hold the ‘SHIFT’ key and, at the same time right-click on the folder’s white space and select ‘open command window here’ from the context menu.
  11. Command Prompt window will now load and you need to enter the following command lines:
    • adb devices – this should display the Nexus 7 device ID and you need to enter the next command now. It it doesn’t appear then you will have to install again the Android SDK files (download links are listed in the preparation guide).
    • For Nexus 7 WiFi enter this command: adb sideload  659e6288b87d.signed-nakasi-JOP40D-from-JOP40C.659e6288.zip 
    • For Nexus 7 3G enter this command: adb sideload 65880f56b1c0.signed-nakasig-JOP40D-from-JOP40C.65880f56.zip
    • These were all the commands you had to enter in order to flash the firmware update. When the ‘Sending: sideload’ message reaches the 100%, the JOP40D Jelly Bean 4.2.1 OTA update will begin to install.
  12. When the update is completed, choose the ‘reboot system now’ option from the recovery menu.
  13. The Nexus 7 will restart and when you see the boot animation logo you can unplug the device from computer.
  14. Test the new Android 4.2.1 firmware and tells us if you like it in comments.

I hope that you managed to update your device. If you can’t complete the OTA firmware installation, then you should leave a detailed comment at the end of this post and I’ll try to offer you a solution.

These were all the instructions that I had for you and your Nexus 7 Wifi / 3G should now be running the latest Android 4.2.1 JOP40D OTA update.

Also, if you’re owning a Nexus 4 device then you can use this guide here and you’ll learn how to flash the same JOP40D Jelly Bean 4.2.1 OTA firmware.

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