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Install Android 4.2.1 Update on Galaxy Nexus (Takju) Manually

The Samsung Galaxy Nexus is now receiving the Android 4.2.1 firmware update through OTA having the build number JOP40D, this update meant for fixing the December month lack bug in the calendar app that we found in Android 4.2. It’s a minor update and there’s no other improvement.

On your Takju Galaxy Nexus, check the OTA notification from Setting>About Phone, but if you haven’t received the notification yet and can’t wait, install the update manually on your phone. Here’s guide to learn how to install Android 4.2.1 OTA firmware on Galaxy Nexus manually. Use a Windows PC with Android ADB drivers installed, you can follow our this guide to install Android ADB on your PC. Back up your Nexus 7 data for safety, you can sync your contacts with Gmail account and for messages use SMS apps, lastly use file expert app to backup apps.

DISCLAIMER: Please proceed the below guide at your own risk, Android Egis will not be held responsible if your device lost data or gets damaged following this guide.


Step #1: Download the Android 4.2.1 OTA Update for your Galaxy Nexus Takju from here.

Step #2: Download the Fastboot Package to your PC.

Step #3: Unzip the downloaded file into C:\ (C drive in my computer) to generate the fastboot folder that contains four files. Then copy the downloaded update zip file to the fastboot folder.

Step #4: Turn off your Galaxy Nexus and reboot your phone into recovery mode, Reboot your phone into recovery mode, to do so reboot phone by holding down volume up, volume down and power buttons, you’ll enter in fastboot mode, there use volume keys to navigate and power button to select. You need to select recovery option to enter in recovery mode.

Step #5: Here hold down the power button first, then press volume up button, it will open up the recovery menu, then select “apply update from adb”.

Step #6: Connect the phone to PC using a USB cable.

Step #7: Open up the command prompt that you can find  at start menu>programs>accessories. Then using command prompt, navigate to the fastboot folder, if you’re using Windows 7 or above, you can open the command prompt directly from the folder, to do so open the folder, there press right click on mouse while holding down shift button on keyboard, then select “open command prompt here”. Or enter the below command on command prompt to navigate to fastboot folder.

cd c:\ fastboot

Step #8: Enter following command, it will deliver your Galaxy Nexus ID number, if it delivers, your phone is connected to PC properly. Otherwise make sure device drivers are installed properly.

adb devices

Step #9: Enter the following command to install the downloaded Android 4.2.1 OTA update .zip file, it will show progress bar on your phone, after that it will start the installation:

adb sideload

Step #10: Once the installation is done, on your phone select “reboot system now”.

Great job, your Galaxy Nexus should now be on Android 4.2.1 firmware, enjoy!

Via: XDA

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