Sony has started to roll out its first firmware update to Xperia XZ1 and Xperia XZ1 Compact smartphones. The latest update brings the 2017 october security patch and general bug fixes . The update moves the build number from 47.1.A.2.324 to version 47.1.A.2.374. We do not have the exact information about the changes that are included in the update. As the update will be released in the phases it will take time to receive the update. To check the update go to settings–> About phone–> Software update.