Just a few days ago the Takju Galaxy Nexus received the Android 4.2.1 update through OTA and now the Yakju Galaxy Nexus (intentional unlock GSM Galaxy Nexus) variant is also receiving the Android 4.2.1 OTA update notifications. It’s a minor OTA update that is released to fix December bug, as most of you know well that December month is missing in the Calendar app of Android 4.2.
You can update your Galaxy Nexus to Android 4.2.1 update through OTA but if you haven’t received the OTA notification or can’t update device with OTA due to any reason, install it manually. This guide shows you how to install Android 4.2.1 update on Galaxy Nexus (yakju) manually.
Bear in mind that your GSM Galaxy Nexus must be on stock Android 4.2 JOP40C build, you can check your device detail from Setting>About Phone. Make sure you’re using Windows PC and USB drivers are installed on the PC.
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 (Yakju).
Step #2: Download the Fastboot Package to your PC.
Step #3: Unzip the downloaded fastboot.zip 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.
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 5f67f5ca4720.signed-yakju-JOP40D-from-JOP40C.5f67f5ca.zip
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!
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