Google’s Android is the most popular mobile operating system followed by Apple’s iOS and Microsoft’s Windows Phone. While the other two OSs are closed in nature, Android is open source and allows after-market development activities through rooting and custom recovery.

However, besides the above-listed rulers of the smartphone industry, there are a number of other operating systems, good and bad, that are still struggling to win the attention of users. The first previews of the Ubuntu OS for mobile devices looked really charming. It was ported to several Android devices in the partly functional state. However, the curiosity phase of Ubuntu OS soon faded out and now we have another ambitious project from the Mozilla family that is having a tough time in creating a space for itself in the market.

Mozilla’s Firefox OS might be struggling to compete with the bigger giants but, like Ubuntu OS, it has finally made its way into Android. XDA member abtekk has been releasing his ported Firefox OS for the Nexus 5 since April, but all the earlier versions of his port had serious bugs. Finally, he has uploaded the latest nightly of the OS that can be said to be highly (if not fully) functional.

If you are an adventurous Nexus 5 user who is keen to give a try to the Firefox OS, it’s your time to experience something new. The latest nightly of ROM is available as system images that can be flashed using Fastboot command just like you install the factory images. The performance of the ROM is a little laggy and you might experience occasional glitches while scrolling the screen. The only major feature that did not work for me was the camera. Everything else, including phone, data, and WiFi work fine.



The procedure described below is not meant for noobs, so stay away if you do not understand what it really is. During Firefox OS  installation on your Nexus 5 all the SD card data, apps, root access, custom recovery present on your Nexus 5 will be wipe. Therefore, we strongly recommend you to backup everything. The only way to return your phone back to stock Android is by flashing the Nexus 5 factory images.


Before you can get the Firefox OS working on your Nexus 5, below are some preparations to be made:

  • Download the latest Firefox OS nightly:
  • Setup ADB and Fastboot on your computer. If you do not how to do so, read our tutorial.
  • Enable Android Debugging on your Nexus 5 from Settings> Developer options. To activate Developer options, read these instructions.
  • Make sure you have installed Google USB drivers on your computer.
  • Charge your phone to ensure 60% battery level.
  • Backup all important data and apps before proceeding.

Installing Firefox OS on Nexus 5

  1. Extract the file to get the flashable images. You will see four files inside the extracted folder:
    • boot.img
    • cache.img
    • system.img
    • userdata.img
  2. Copy these files to the platform-tools or ADB-Fastboot folder.
  3. Now launch a command prompt from inside the folder where you have copied the .img files.
  4. Connect your Nexus 5 to the computer and issue the following command and hit Enter key to reboot the device into Bootloader/Fastboot mode:
    adb reboot bootloader
  5. When the phone shows up the Bootloader screen with Start written on the top, flash the images one by one using the following commands:
    fastboot flash system system.img
    fastboot flash boot boot.img
    fastboot flash userdata userdata.img
    fastboot flash cache cache.img
  6. When all images are flashed, run the following command:
    fastboot reboot-bootloader
  7. Finally, reboot the device.

When your Nexus 5 boots up, you’ll see Firefox OS setup. Just go through the setup and you will be welcomed by the home screen. Enjoy Firefox OS on your Nexus 5! In case you want to return to stock Android, use the following guide:

Restore Nexus 5 to Stock and Flash Factory Images

Also See: Nexus 5 Tips and Tricks

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