How to upgrade my At&t S4 i337 to android 4.4?

[charbelhaddad]

Hello, I have an unlocked Galaxy S4 i337 At&t (i am currently using another carrier) unrooted. I know that Android 4.3 is released for my phone, and so is Android 4.4 and 4.4.2 and soon will be Android 4.4.3 .. however, i am still stuck on 4.2.2 and im not getting the update via OTA nor via KIES, since both are telling me the latest updates are installed on my phone..
Help? Anyone?
PS: 1) my baseband version is I337UCUAMF3...
2) I do not want to root my phone..

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[Jace Race]

Did you figure it out, I have the same issue?
Thanks