[Port]Official Android 6.0 Marshmallow V30B2 for AT&T LG G3 D850


Now you can easily download and install Official Android 6.0 Marshmallow V30B2 firmware on AT&T LG G3 D850. This is not the official ROM released by AT&T but it’s a ported ROM from the stock firmware earlier released for LG G3. The stock ported ROM is modified by the developers along multiple tweaks and then made it compatible to be installed on AT&T LG G3 D850.

The process is very simple as we have already posted guides on the AOSP builds for several other devices, you can have an overview of them and in this tutorial we are going to follow the same process. Just go ahead and install the latest firmware Android 6.0 Marshmallow on your AT&T LG G3 D850.

Also read: Download Android 6.0 Stock Marshmallow D85030K firmware for AT&T LG G3

How to install Official Android 6.0 Marshmallow on AT&T LG G3 D850 via stock ported ROM

Before you Begin:

Disclaimer: This tutorial includes multiple operations including Custom Rom, custom recovery etc. 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.


  • Please ensure your phone battery should be charged at minimum 80%
  • Download LG USB drivers
  • Your device should have a working TWRP or CWM recovery.

Necessary downloads:

Download Official Android 6.0 Marshmallow for AT&T LG G3 D850

Process to install official Android 6.0 Marshmallow on AT&T LG G3 D850 via Ported ROM

Connect your device to your PC and copy the ROM zip file on your device storage.

Turn of your device and boot into TWRP custom Recovery menu by the hardware keys combination or using any third party app (Mostly found in Play store).

Once your device enters into TWRP recovery, create a Nandroid backup of your device or follow our guide to create a Nandroid backup (this will create a backup of your complete device including current firmware) if something goes wrong you can restore your previous firmware.

Once the Nandroid process completes, tap on “Wipe” and then swipe the slider from left to right to begin the wipe process (This will reset your device to factory)

Now it’s the time to flash the Marshmallow firmware in your device. Choose install and navigate to the folder in which you have copied the Marshmallow ROM zip file

Swipe across the slider to confirm install, wait for a few minutes till the file is completely installed on your device.

Once completed reboot your device.

If your device is taking longer then 7-10 minutes then follow this guide to to fix this issue

That’s it! You have successfully installed Official Android 6.0 Marshmallow on AT&T LG G3 D850 via stock ported ROM. If you have any query feel free to contact us by posting your queries in the below provided comment section. Follow us 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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