The update includes major improvements which include Mobile Hotspot APN, DirecTV HDR API, and many other things with November security patch. The November security patch includes major Wi-Fi security flaw. The Krack Wi-Fi security flaw was recently discovered and but it is not due to the weakness of Samsung’s software or hardware. It is the vulnerability in WPA2 Wi-Fi security protocol. As the Krack attack vulnerability goes Wi-Fi connection exposed, users with affected Galaxy S8 and S8 Plus devices run the risk of even data theft and remote ransomware code injection. The Android November 2017 security patch is packed with fixes for 61 Vulnerabilities and Exposures found in the Android OS. The update weighs 480 MB in size and tagged with the build number G950USQU2BQK5 on the Samsung Galaxy S8, and build number G955USQU2BQK5 on the Samsung Galaxy S8 Plus. As per the official changelog released by AT&T, the Galaxy S8, and S8 Plus add support for the mobile hotspot APN, DirecTV HDR API, other stability improvements and bug fixes. This update also improves the network performance and improves the overall experience of the device. Samsung will roll out the same update to all the carriers variants of Galaxy S8 and S8 Plus in the US to make it much easier to switch between the carriers without doing any factory reset. And additionally when you switch between the carriers, if there are any Pre-installed carrier apps will be automatically disabled with the simple reboot. This update is rolling out via OTA (Over The Air).Those who didn’t wait for OTA they can also try manually pulling the firmware by going to the Settings –> About Device –> Check for Updates. If you want to wait for OTA, then it may take few days to reach all corners of the world. Source AT&T 1, 2
