via the LG Bridge software before the official over-the-air update process began shortly after. Those rocking an AT&T handset need not mess around with Bridge, for the update is available OTA as of now. If you do want to update immediately, fire up the Settings app on your device and navigate through About Phone --> Update Center --> System Updates --> Check for Update. As ever, you'd need more than half of your battery life available, and a Wi-Fi connection to process what is quite a sizable (971 MB) bundle.Last week, T-Mobile customers were able to grab Android 6.0 Marshmallow
Even if you don't follow the above instructions, the release has begun, so a notification should arrive to your AT&T LG G4 in the very near future. Though a smooth update and installation should be a formality, you may wish to back up your data before proceeding, particularly if you have information that you don't wish to lose.