It was actually the 5th time I downloaded the update package through OTA( 912.15MB big, around 12 mins each time).
And it FAILED every single time at 28% of "instailling the update" and the android man fall on the ground with a red exclamation mark.
Managed to update it with the Kies 3, but I could not find any update option within the software.
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Thank you for replying me.
No unfortunately it was failed too.
Based on my research, I can only make it through Kies 3 if it received the upgrade. BUT, nothing appears but my current system num when I connect to the software.
Is your S5 running the stock rom or did you flash a custom one by any chance?