Update [November 10, 2017]: As expected, the same update is live for the S8+ too, coming in as version G955USQU1AQJC, and weighing in between 162MB-467MB depending on your current software. Of course, this also fixes KRACK WiFi vulnerability, and also includes October patch.
AT&T Samsung Galaxy S8 users should be receiving a new software update at the moment. This new update brings a new Android security patch, bug fixes, some other improvements, but most notably, fix for KRACK Wi-Fi security issue, a vulnerability that was fixed by Verizon too on its S8 handsets few days ago.
If you’re using the Galaxy S8 on AT&T, then you should receive the update very soon. The update carries the build number G950USQU1AQJC, as seen in the screenshot above. It is still Android 7.0 Nougat, and it installs the October Android Security patch. It’s sized about 165-473MB. depending on your current software version.
The Samsung Experience version is 8.1, and that’s about all we know so far. This is a recommended install, and is more of a security update. Samsung and other US carriers have been releasing similar updates for other devices as well.
The Galaxy S8 and the S8+ are also receiving the Android 8.0 Oreo update with the new Samsung Experience 9.0. The update is still in beta and is only available for those part of the Galaxy Beta program in the US, UK, and Korea. The stable public version of the software should start rolling out later this year and in early 2018.
Before installing this update on your AT&T Galaxy S8, make sure the device has more than 50 percent charge, and is connected to a stable WiFi network. You can manually check for the update by heading to Settings > About Phone > Software Updates on your device.