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    How to install AOSP ROM (Android 5.1) on LG Optimus 4X HD

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    Alejandra Rangel
    @alejandrarangel

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    How to Install AOSP ROM (Android 5.1) on LG Optimus 4X HD, Android 5.1 Lollipop roms are fast becoming the new trend. Every day we are seeing new devices receiving beta and alpha versions based on Android 5.1 the latest version of the new Google OS now also for the LG Optimus 4X HD which is the next lucky phone.


    Google has been working very hard on Android 5.1. The company added new features and changed the user interface. Also, some annoying bugs and problems encountered in previous versions have been fixed.



    Originally released with Android 4.0 Ice Cream Sandwich, but like most of LG's devices, the Optimus 4X HD only got an update to Android 4.1 Jelly Bean. Thankfully, all users can upgrade to Android 5.1 by installing the AOSP ROM. Follow the guide below to update LG Optimus 4X HD to Android 5.1.

    In this tutorial, we will tell you how to install AOSP Custom ROM ROM 5.1.1 on LG Optimus 4X HD and we also have a number of important tips that you need to keep in mind before proceeding to the tutorial. Let's get on with the tutorial now.


    The following tips are important as they will help you complete the installation procedure and make it go smoothly without any problems.

    So, before going to the installation process of the AOSP Custom ROM, let's take a look at how to backup all data. When installing this custom ROM based on Lollipop 5.1, your data will be deleted and your phone will be as good as new.


    Installare i driver: Make sure you have installed the USB drivers for the LG Optimus 4X HD correctly. If not, you can download the latest official drivers from our Android USB driver section here: DOWNLOAD ANDROID USB DRIVER FOR SAMSUNG, HTC, NEXUS, LG, SONY & OTHERS



    Back up your apps: 

    • Download AirDroid from the Google Play Store.
    • A Windows / Mac / Linux computer on the same WiFi network as the phone.
    • An Android phone or tablet, of course!

    Open AirDroid on your phone and launch the application.

    Enter the IP address (and port) in the URL field in your browser and enter the password that was given to you by the application on your phone.


    Now you can backup your contacts, files and pictures. To make the Backup just click on the Apps icon and a window will open showing all the applications on the phone.

    Select all applications or only the important ones you want to backup.

    After selecting them, click on the download button at the top right of the window.

    After pressing Download, AirDroid will download all selected applications to your computer in .ZIP format. If only one app has been selected, the downloaded file will be in apk format.

    Back up your Gmail and Google contacts just >> Synchronize with Google Sync.


    How to backup WhatsApp messages, open the app >> open the menu and go to settings >> go to chat settings >> at the bottom click back up conversations.

    How to enable USB debugging mode go to device Settings menu >> Go to submenu in some devices the submenu will be called Other / General >> now scroll to “Build Number” and tap 7 times. After tapping 7 times you will see a notice saying “You are now a developer” / “Developer mode has been activated”. Now go to the Settings menu and you will see the developer options submenu >> tap developer options and then enable USB debugging.


    Make sure your Android device has the battery charges up to 80-85%.

    The device must have the latest CWM or TWRP version installed, if you do not find the guide on this blog, go to Google.

    It is recommended to clean up the dalvik cache before starting to install this custom rom.

    Caution: this tutorial is for the LG Optimus 4X HD. Do not try this guide on any other Android device. Furthermore, we are not responsible for any damage caused by the instructions provided on this page. Try this guide at your own risk. However, it is very unlikely that the device will be damaged if you follow all the instructions that have been mentioned in the procedure.

    How to install AOSP Custom ROM (Android 5.1) on LG Optimus 4X HD

    Download AOSP Custom ROM and Google Apps for the LG Optimus 4X HD on the computer.


    Connect the LG Optimus 4X HD to your computer using the USB cable.

    Copy or paste the downloaded files to your phone's memory / SD card. Make sure the files are located in the root folder of your phone's memory / SD.

    Turn off the phone and disconnect from the USB cable.

    Now enter the custom recovery mode. Turn on the phone by holding Volume Up + Power Button together.

    Once you are in custom recovery, select a full data wipe by selecting “wipe data / factory reset”. Use the power button to select everything while you are in recovery mode.

    Then, perform a cache wipe, “Wipe cache partition”.

    This is optional, but wiping the Dalvik cache is recommended. So the phone will not be able to get stuck in bootloop. From recovery, go to 'advanced' and select “wipe Dalvik cache”.


    Then go back to the main recovery screen and select “install zip from SD card”.

    Select “choose zip from sdcard”. Using the volume keys, navigate to the zip file that you copied earlier to the SD card and select it with the power button. Confirm the installation on the next screen and the procedure should start right away.

    GoogleApps: Repeat the same operation for the Google Apps and install them on your phone.

    Once the installation is complete, go to “+++++ Back +++++” and restart your phone by selecting ”reboot system now“ from the recovery menu.

    Your LG Optimus 4X HD it will reboot and may take about 5 minutes to reboot. So, you have to wait.

    That's all! Your LG Optimus 4X HD it should now have installed Android 5.1 with AOSP Custom ROM (Android 5.1) on your mobile! Go to Settings> About phone to check.

    If you run into any problems, feel free to drop us a comment below and we'll get back to you with a fix or solution to your problem.

    Further Reading:

    • Where to download TWRP Recovery for LG devices and… how to install
    • Download and install Lineage OS 17.1 on Samsung Galaxy S2 (Android 10)
    • The best Android ROMs you can install in 2019
    • How to install Android 10 - 55 phones
    • List of Android phones that can be upgraded to Android 10 (LineageOS 17.1)
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