Need your help guys iPhone 5 GSM with JB 6.1.2

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So I have this iPhone 5 A1428 with 6.1.2 (JB)
I want to update to ios8. Downloaded the proper ipsw but when I try to update via iTunes I get:
"this iphone *** could not be updated. this device isn't eligible for the requested build."

I looked all over the internet, tried all the solutions (updated itunes, checked the hosts file etc.) nothing worked.

Please help. Any clue will be greatly appreciated!
Thanks!
Dan

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