I got the same thing on my s5 , I factory reset and now I don't get the notification at all...
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I tried that, it said check back in 48 hours.
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Ok I get the software update it downloads then it reboots in recovery where it has att logo then it says update to 28% then says fail. ..then reboots I tried this like 4 times it keeps saying failed.
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Yeah...
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