Android 4.2.1 JOP40D firmware has been launched for the Nexus 4 by Google only a couple of days ago and now you can use this tutorial and learn how to root it. Apply all the instruction I’ve listed and make sure that you don’t skip any steps as that will not complete the update.
This is a tutorial that is destined to be used to root the JOP40D firmware of Android 4.2.1 on Google Nexus 4. There is already a guide that teaches users of rooted devices how to flash the same stock firwmare but one that is already rooted and de-odexed ( here you can find it ), but this post comes for those users are on stock devices and wish to get their phones rooted only now.
If you want to correctly root your Nexus 4, then you should read the pre-requisites and guidelines below. This extra info will help you flash the root files for Android 4.2.1 JOP40D firmware at your first attempt. Here’s what you need to know:
- Use this guide only with the Google Nexus 4 smartphone. Do not attempt to root any other Android devices using the files in this post, as that will brick them.
- Make sure that your computer has the Android SDK files installed on it. Download from HERE. This will install the adb files required to flash the root on Nexus 4.
- Unlock the bootloader of your smartphone using this guide here. If your device already runs on unlocked bootrom then you can skip this step.
- Note that this guide will not only root your Nexus 4, but it will also install CWM Recovery image.
- Create a full NANDROID backup of the currently installed ROM.
- Create backups of your most important files before moving to the tutorial.
- Enable the USB debugging option from the Developer Options in Android 4.2 Settings menu. NOTE: the developer options in Android 4.2 are hidden and you have to unhide them by opening Settings, then About phone and then you need to tap the Build Number section 7 times.
- Charge your phone’s battery so that it won’t power off during the root process.
- Note that we cannot be blamed in case something goes wrong and you cannot boot your device after the flashing of all files. Make sure that you don’t skip any steps that I’ve listed below, as that will not complete the install.
If you’ve met all the requirements above and understood all the guidelines, then you should get to the next part. After you flash the files below you will acquire root for your new Google smartphone and its latest firmware.
How to root Google Nexus 4 on Android 4.2.1 JOP40D Firmware:
- Download the Fastboot zip from HERE.
- Extract the Fastboot file to a folder that is named just like that. Place the Fastboot folder on your computer’s desktop screen.
- Download the SuperSU v0.98 from HERE. After the download of this file is complete you should connect your phone to PC using the USB cable. Move the SuperSU zip to the phone’s internal SD card. When the transfer is complete you have to disconnect the devices.
- Power off your smartphone now.
- Next, download the CWM recovery touch 220.127.116.11 file from HERE. Move this file to the Fastboot folder when the download is complete.
- Now you have to boot your Nexus 4 into bootloader/ fastboot mode. Do it by pressing ‘volume down’ and ‘power’ and release the buttons when the screen powers ON as it will boot the bootloader mode.
- Connect your Nexus 4 to your computer using the USB cable again. Wait until the drivers are installed and then get to the next step.
- Go to the Fastboot folder and press the ‘Shift’ keyboard button and while doing this you need to right-click on the folder’s white space. Select ‘open command window here’.
- Command Prompt window is now shown and you have to enter the following command line: fastboot flash recovery recovery-clockwork-touch-18.104.22.168-mako
- The command line will flash the CWM Recovery touch on your device. You can unplug the phone from PC now.
- Now you can select the ‘Recovery mode’ option from the Fastboot menu and then your device will boot the custom recovery mode.
- Select the ‘flash zip from sdcard’ option and from the new menu you should select ‘choose zip from sdcard’. Find the SuperSU file and confirm its installation. This is the root file.
- Get to the main recovery menu when the root file is flashed successfully.
- Select ‘reboot system now’ option and wait at least 5 minutes for the first boot process of this new rooted firmware to load all files.
- Test to see if your device is rooted by downloading the Root Checker tool from Google Play Store. This app will tell you if your device is rooted.
These were all the instructions that you had to follow in order to successfully root your Nexus 4 device. If you got stuck or you cannot complete the tutorial, then you should ask for more in our comments field. We will try to come up with a working solution for you. However, if you carefully applied all of the above then you should have managed to flash the root files in under 10 minutes.
Remember that this guide will work only with the Android 4.2.1 JOP40D firmware that runs on Google Nexus 4.
Visit our Nexus 4 section to learn more about the phone and you might find some other interesting guides, that you can use to improve the performances of your device.