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Update Google Nexus 4 with leaked Android 4.3 Jelly Bean JWR66N firmware

The new Android 4.3 Jelly Bean update is around the corner, but there is already a leaked system dump which means that you can now update your Nexus 4 phone. Use this tutorial to learn how to do that easily using a custom Recovery such as TWRP to complete the update.

JWR66N is the firmware build of this Android 4.3 JB ROM. The system dump has been leaked as a TWRP Backup file but some XDA developers managed to release pre-rooted and deodexed zip files. Before starting the updating process, you should read the preparation guide below and learn more about this release and why you should only use the guide if you’re an advanced Android user.

There is no official Android 4.3 Changelog for Nexus 4, but after some testing we’ve found that the following things stood out as the most important changes from Android 4.2:

  • The lockscreen in Android 4.2 features the clock in the status bar, but that’s not happening anymore in Android 4.3. 
  • Camera UI now rotates only the icons rather than rotating the entire application when switching between portrait and landscape camera.
  • Camera App now allows you to use the Volume Keys to take pictures.
  • Nexus 4 touchscreen seems to respond much more easily to lighter touches, which should improve the gesture typing.
  • Dialer now features a t9 optional function, which needs to be enabled in order to use the numbers to easily search your device for the contacts you wish to call.
  • Dialer now support pauses and waits.
  • Nexus 4 will now be able to scan for WiFi based location info even when the WiFi connection is disabled.
  • smoother animations.
  • Google Keep is now a system application.
  • Added new Developer Options that will allow you to optimize applications to 60FPS.
  • Hidden Notification History can be accessed from Settings.
  • Bluetooth LE – Low Energy support added along with support for streaming song metadata via Bluetooth.
  • Improved battery life
  • Wi-Fi, Mobile Data and Bluetooth fixes have been added so that you won’t experience any problems while using it.
  • There are some other small additions, but we will learn more when the official Android 4.3 Jelly Bean release will take place.

IMPORTANT GUIDELINES: Before starting the installation, you should read the guidelines below. You’ll learn what files you need to download and how you can complete the installation without problems. Here’s what you need to know:

  • This Android 4.3 system dump has been leaked firstly as a TWRP Backup. That’s a file that is usually created with TWRP Recovery and it can restore only using TWRP.
  • You can restore the backup Android 4.3 file using TWRP 2.5 and later versions.
  • Now, gmillz from XDA forums managed to create a flashable zip file that can be installed using any type of Custom Recovery such as CWM or TWRP.
  • The zip created by Gmillz is pre-rooted.
  • Also, there is a second zip made by the same gmillz. This second zip is deodexed and it features an insecure kernel, which means that you can ‘adb root’.
  • no data will be lost while trying to update your device. The new firmware will install over any type of ROM you currently have installed on your Nexus 4.
  • Rooting this ROM might be somewhat tricky, but you can try to apply root on your own using Chainfire’s CF Auto Root tool for Android 4.3
  • Make sure that your phone’s battery has enough power left before the phone powers off completely.
  • Despite the fact that this installation shouldn’t wipe any data, it is still recommended for you to create a full NANDROID backup of your current OS.
  • This is a guide for advanced Android users. You cannot blame us in case you lose data or you brick your device while trying to update it.
  • Your phone has to be on an unlocked bootloader, while rooting is only optional.
  • Make sure that you have the Android SDK installed on your PC and that the ADB is working.
  • Use the TWRP Recovery for this tutorial to work. CWM might work but it might show some errors in the process.
  • Read the entire post and ask for extra help in comments in case you cannot complete the installation.

Now that you know all of the above, I think that you can continue to the next part of this post and learn how to flash the leaked Android 4.3 Jelly Bean ROM for your Google Nexus 4 phone. Don’t skip any steps listed below.

How to install leaked Android 4.3 Jelly Bean for Google Nexus 4:

  1. Boot your device into TWRP Recovery.
  2. Create a NANDROID backup of your current ROM using the ‘Backup’ option.
  3. Download any of the following zip files here. I recommend you to use the deodexed + insecure kernel file.
    > save the file on your PC.
  4. Connect your smartphone with your PC using the USB data cable.
    > note that you should have the Android SDK installed on your PC and adb working.
  5. From the TWRP Recovery mode main screen select Advanced, then ADB Sideload from TWRP. Check the Wipe Dalvik Cache and Wipe Cache options.
  6. Open the command prompt on your PC.
  7. Next, type in adb sideload following by the location path of the zip file downloaded in step 3.
  8. Wait for the installation to complete, then disconnect the phone from PC and boot into normal mode.
  9. Test all the new features and see if your device is running faster than it did until now.

If you don’t like to use the ‘adb sideload’ method, then you can choose to use the Install and flash zip TWRP Recovery functions. Simply place the ROM zip file on your phone’s internal SDcard and then boot the device into TWRP Recovery. Use the Install button and flash the ROM, reboot the Nexus 4 and that should be all.

Use a root checking tool to verify that the device has been rooted successfully. In case you’re told that the root has not been successfully, then you can try to use the SuperSU file listed by Chainfire in this Google+ post here or here.

These were all the instructions that I had for you, now you should test the new OS. If you’re having problems with the update, then you can ask for extra help in comments.

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