When your press update when you go into about device just after updating your device it'll always say you have the latest update etc. But then when the announcement that theres gunna be a new update for the handset coming and the same day you try updating it comes up with a error message saying you've tried too many times or that too many requests have been made on the server try again later or connect to Samsung kies this usually means in my previous experience that there's an update being pushed to stock s4 devices right now.
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Sent from my GT-I9505 using Tapatalk 2