AT&T LG G5 and V10 rolling out with a new firmware update which brings Android security patch for the month of March. The update comes with a build number NRD90U and MRA58K, and weighing in at 67MB and 57MB, respectively.
What other changes (if any) the update has brought is currently unknown.
It’s an OTA update so will take time to reach every unit so be patient. Meanwhile you can head over to Setting’s menu of your phone and see if the update is available for your device or not.