Install Marshmallow 6.21.605.3 firmware on Verizon HTC One M8


Verizon just started seeding Android 6.0 Marshmallow update for HTC One M8. The update carries software version 6.21.605.3 and is packed with ton of latest features including Doze Battery Optimization feature, Google Now on Tap and more. The update is rolling out via OTA and will knock at your device anytime soon, however you can also flash the firmware manually but you have to wait a while until we managed to grab the Marshmallow 6.21.605.3 firmware for you. So till then just go ahead and check the Over The Air update by following the below mentioned procedure.

How to update Verizon HTC One M8 to Android 6.0 Marshmallow 6.21.605.3 firmware

This is the first and preferably the most easiest method to update your device, you can use your device to download the firmware file if available and then the device will ask you to install the updates now or later. To check whether your device is eligible for OTA Firmware update, unlock your device & navigate to

Settings >> About device >> Software update >> Check for updates

This will require a working internet connection to connect to the servers. You will receive a notification about the latest firmware availability click install to flash the firmware or tap install later to flash the latest update anytime later.

Note: The Android 6.0 Marshmallow  6.21.605.3 firmware for HTC One M8 update link will soon be available as a flashable file and there you will be able to install it manually, this method would be helpful if you are not getting the OTA notification so stay connected.

That’s it! If you have successfully updated your Verizon HTC One M8 on 6.21.605.3 firmware via OTA, let us know or if you have any query contact us by posting your opinion in the below provided comment box.

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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