BlackBerry KEYone for AT&T comes with 3GB RAM and 32GB internal storage variant. The Phone was available in US from Q3,2017. Now the phone started to receive a new update. The update brings the latest January security patch, with the protection from the Meltdown and Spectre flaws. The update weighs around 42MB in size.
The update brings the build number as AAT30. To update the phone must be in the previous version AAR649.
To Check the update manually go to Settings > AT&T Software updates > Check for updates.