AT&T carrier begins to roll out March 2017 security patch update for LG V10 and G5 users in U.S. For LG G5 the firmware update comes with new build number (NRD90U) and software version (H82020i). The download size comes in 67MB and it’s currently running on android 7.0 nougat os. The lg v10 will receive the update as MRA58K (build number) and H90021z (software version). The update size weighs in 56.9MB and it runs on android 6.0 marshmallow os.
As you know the software update will be rolled out through FOTA. If you have connected your device to WiFi network then you will get update notification. Otherwise check for manual update from Settings > About Phone > Software update > Update Now. After installing this update both handsets security patch level will be bumped to March 1, 2017.