AT&T carrier started to rolled out a software update to Samsung Galaxy S5 smartphone users in USA. AT&T posted this will not update your device to Android 5.1. It will improve the galaxy S5 performance and security features. The download size of this update will be 296 MB.  It will be available to your device via FOTA (Firmware-Over-The-Air) and requires WiFi connection to download.

The user can initiate the software update manually by using Settings > About device > Software update. Once you received the notification download the update file with WiFi network. After the download, it will restart the device and install the update file. The software update will not delete any files from your mobile.

Click here for Samsung Galaxy S5 Full Specifications