Download Stock Android 6.0 Marshmallow firmware for Asus ZenFone Zoom ZX551ML [WW-4.21.40.74]

asus-zenfone-zoom

ZenFone Zoom started receiving Stock Android 6.0 Marshmallow firmware by Asus. The Marshmallow update for Asus ZenFone Zoom model ZX551ML carries build number WW-4.21.40.74 and is live via OTA. The Android 6.0 Marshmallow firmware for Asus ZenFone Zoom will hit your device anytime soon but if you are getting impatient to download the stock Marshmallow zip for your device then follow the description below, there you would be able to download Android 6.0 Marshmallow WW-4.21.40.74 firmware for Asus ZenFone Zoom ZX551ML. Give a check for the OTA update, navigate to

Settings >> About device >> Check for updates

Below we have mentioned two different procedures to update your device on Android 6.0 Marshmallow firmware , just go ahead and follow them to install the latest Android 6.0 Marshmallow WW-4.21.40.74 firmware on your Asus ZenFone Zoom ZX551ML.

How to install Android 6.0 Marshmallow WW-4.21.40.74 firmware on Asus ZenFone Zoom ZX551ML

Before you begin:

Disclaimer: This tutorial includes multiple operations which include flashing Stock Firmware. Follow the guide on your own risk, we are not responsible if you brick or damage your device however the chances of bricking a device are rare but you have to pay full attention on the complete guide to avoid any issues and difficulties while performing any of the above mentioned operation.

Your phone battery should be charged minimum 60%

Download Asus USB drivers

Download these files:

Download Android 6.0 Marshmallow WW-4.21.40.74 firmware for Asus ZenFone Zoom ZX551ML

Procedure to install Android 6.0 Marshmallow WW-4.21.40.74 firmware on Asus ZenFone Zoom ZX551ML via Stock Recovery (Non Rooted devices)

  • Copy the Android 6.0 Marshmallow WW-4.21.40.74 firmware OTA zip file to the internal memory of your Asus ZenFone Zoom ZX551ML
  • Turn off your device and reboot into recovery mode.
  • Once in recovery, use Vol up or Vol down button to navigate and select apply updates.
  • Browse and select update zip file and flash it.
  • Once done reboot your device.

That’s it! If you have successfully updated Android 6.0 Marshmallow WW-4.21.40.74 firmware on your Asus ZenFone Zoom ZX551ML please let us know, for any query feel free to contact us by posting your queries in the below provided comment section. Please give us like to say thanks and stay tune on Facebook/Twitter/Google+ for future update.

A Software Engineer who loves to hang around latest gadgets and writes his own experiences to get the best possible and accurate information.

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