Restore Your Motorola Atrix 4G Back to 4.5.91 Stock Firmware

by: Paul NuñalFebruary 19, 2012
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With so many Android phones literally flooding the market these days, it’s no wonder that there are also so many firmware upgrades and custom firmware being developed and released every now and then.  A superior device with great stuff neatly packed into it, the Motorola Atrix 4G is one of the devices for whom developers have devoted significant firmware love.

One reason for the attention that devs give to the Atrix 4G is that it is a fantastic device with a dual-core Nvidia Tegra 2 processor and robust ability for handling impressive graphics and video without choking. Together with its powerful processor and 1 GB of RAM, the Atrix 4G is a mean powerhouse that can be further exploited with the use of third-party applications and custom ROMs.

In an age where technology is constantly changing at an alarming pace it is important to always have a trusted source to get your updates in a timely fashion. Custom ROMs and factory firmware updates have played a crucial role in the development in many of our devices.

For those of you who have rooted your Atrix 4G and already have installed custom ROMs, then you might already have some bad experiences with regards to unofficial firmware sources.  Unofficial firmware such as custom ROMs are literally filled with many bugs and disabled features. In many cases, these ROMs are not stable for daily use.

Luckily for owners of the Motorola Atrix 4G, there’s an escape hatch for reverting to stock, functioning firmware and return the phone to its factory state.

In this tutorial, you will learn how to roll back your Motorola Atrix 4G to the official firmware version 4.5.91, regardless of your current firmware.



  1. Download the following files listed above and extract their contents into a folder on your computer.
  2. Enable USB Debugging on your device by heading to “Settings > Applications > Development > USB Debugging”. Make sure that there is a check mark on the USB Debugging option.
  3. Turn off your device and boot into Fastboot mode by pressing and holding down the Volume Down button and pressing the Power key.
  4. Once inside Fastboot mode, connect your device to your computer via USB cable.
  5. After connecting your device, launch a command prompt on your computer.
  6. Change directory to where you extracted the downloaded files.
  7. Type the following commands below and press the Enter key after each line:
    • moto-fastboot flash boot boot.img
    • moto-fastboot flash system system.img
    • moto-fastboot –w
    • moto-fastboot reboot
  8. Once the last command has been entered, your device should reboot.
  9. Check whether or not you have successfully flashed the stock firmware by heading to “Settings > About Phone > Firmware Version” where it should show the current firmware version as 4.5.91. If there is another version except the one mentioned, then you need to redo the steps.

Congratulations! You have successfully flashed stock firmware version 4.5.91 on your Motorola Atrix 4G.

  • jzaslice

    Does this include devices with unlocked bootloaders? A couple of users on XDA were bricking their phones when trying to update to the latest stock build with an unlocked bootloader, albeit some users turned to RSD but I believe this guide should mention something about unlocked devices, whether this method is safe or not.

  • Harbinger

    I’m wondering if this will also remove personal data such as contacts and downloaded apps?

  • Prashanthkr86

    after doing it wen i restarted it says reboot failed plz help

  • Alessandro Rossi

    Be very careful!!!!!!

    This method does not work on every Atrix!!!!!!!!!!!

    Thank you very much.
    Following your instructions now I brick my phone. I’m a stupid but you’re a bast**d!!!!!

    Please don’t write a tutorial next times if you don’t know what you’re talking about!!!

    • I cannot agree more! My phone is bricked too! A-holes like this should be shot and their mother raped to death too!

  • f*** my phone up as well…wont even boot after that. Thank u mister smartass!!

  • Corax

    i gues it will not work with unlocket fones, since my Atrix 4g (ME860, Asian version) would not boot to stock ROM ater unlocking. I had to Flash CM9 instead.

    Harbinger, it will remove al your personal data, apps, etc…

  • Well all I can say is that it worked for me. no brick but webtop is nonexistent. I have a few things i can try but if someone can help here that would be good. I did notice a pattern in the above stuff and i’m assuming i could try moto-fastboot flash webtop webtop.img. Am I correct?

  • addam012

    this works Great! it Unbricked my Atrix!!!!!! now it is back to Stock!!! but when at&t wanted the latest update, it has it stuck doing massive shut downs and restarts. I Flashed the Atrix again. But I will not do the update…

  • jose c

    Trying to revert your phonr to stock is stupid unless it’s for any warranty issue, because you can always flash a stock rom through cwm, and in most cases there is always a better alternative to stock rom as long as it is a stable build

  • Steve B.

    Thanks a lot man!, Great!

    Gracias gracias muchas gracias por la ayuda mi telefono estaba quebrado ahora ya funciona.

  • Jon

    Thanks for the information.

    The link to the stock rom says error this has been removed because of copywrite blah blah.
    I was needing a back up image for security purposes only, and just got my NEW Atrix.

    Well thanks again for your review.

  • JD

    I noticed that Paul Nuñal hasn’t replied to any of these help needed requests? Why is that?

    Does the hoster know Paul Nuñal “cut and ran?”

    I clicked on the link for the stock ROM for my Bell Altix 4G and got … This file is either removed due to copyright claim or is deleted by the uploader. (I guess latter!)

    I’m a member of xda and to many bricked their Altix 4Gs by downgrading. More than likely having to do with AT&T or Bell stock ROM are NOT the same phones.

    Maybe I.m lucky to have that Stock ROM removed before I made a paper weight out of my favorite toy.

    I have 45.21.71.mb860.BellMobility.en CA and really would like the Stock Bell Rom for warranty purposes only.

    Anyone have a real live link?


  • Bruno

    that is for atrix 4g Bell or AT&T??