Technical details of the G900AUCU4COI5 5.1.1 Update:
Device: GALAXY S5
Model number: SM-G900A
Android version: 5.1.1
Baseband version: G900AUCU4COI5
Kernel version: 3.4.0-586384
Build number: LMY47X.G900AUCU4COI5
Enhancements and Improvements:
- Android 5.1.1
- Android For Work
- Security updates
- Fix to Ultra Power Saver mode for devices using On Device Encryption
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| A screenshot of the Android 5.1.1 update to build G900AUCU4COI5, taken from the device settings |
According to AT&T, the G900AUCU4COI5 5.1.1 update is available via Over-The-Air (OTA) update and thru Samsung Smart Switch for PC. The update weighs at around 610 MB in file size to download. If you haven't received the update's notification, you can check it manually by heading into your phone's Settings > About Device and then simply check for an update. You may also head over at AT&T's support page for further details about the said Android 5.1.1 update.
Source

2 comments:
I tried this update 2 days in a row and 2 days in a row it downloaded it OTA then restarted my phone and said update failed.
Try to clear data cache. 1) You must backup all data stored in the phone's memory. 2) Press and hold down Volume up+Home+Power keys at the same time. 3) Once in recovery mode's given options, select Wipe Data/Factory Reset. 4) Try to OTA update again.
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