LG G4 units on AT&T network have started receiving a new firmware update. The update which is being rolled out over the air installs the latest monthly security patch.
The software version of the update is H81022f which weighs 28.9MB. Although a minor one, the update is highly recommended as it brings the May security patch to your G4 smartphone as well as fixes regular bugs.
If you own an AT&T locked LG G4, you should receive a notification about the update soon. Alternately you can check for the update by heading to Settings > About device > System updates. The update is Marshmallow based as LG G4 is yet to receive the Nougat update, which should happen sometime in the third quarter of this year.
Meanwhile, the T-Mobile variants of G4 have also started getting a new firmware update which brings a fix for E911 issue as well as installs monthly security patch.
Read: LG G4 update