However, make sure you backup everything before you proceed.

Likewise, if your device is running an untouched firmware and non-rooted, then you may proceed with the LGUP installation procedure.

If your device is heavily modified or has been rooted, then you may proceed with the TWRP procedure and flash the Zip file right away. Hence, no matter whether your device is rooted or not, you can still get your device to the stock firmware from LG. Courtesy of the members at XDA-Developers and other such forums, the files are available as stock KDZ, TOT, as well as TWRP flashable zip files. The latest files are now available for many of its variants and the latest one to receive this update is the T-Mobile LG G4. The update rolled out earlier last month with some stability improvements and a brand new Android 6.0 Marshmallow firmware with UI enhancements. Marshmallow firmware update for the Sprint and the international variant of the LG G4 is already out and here we are with the downloads and installation procedure.

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