The update with build number G900AUCU4COI5 brings Android for Work, bug fixes, some security updates, and improvements to Ultra Power Saving mode for devices using On Device Encryption. Wi-Fi is required for downloading this update on the Galaxy S5. The update has a file size of 609-999MB depending on the firmware that is currently running on your device, and it is rolling out now through OTA.
You can check out for the update by heading over to Settings » About Device » Software Update » Update Now.
Here’s the full changelog
Android For Work
Fix to Ultra Power Saver mode for devices using On Device Encryption
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