Why won't my GS4 at&t update via stock recovery.

[SLEETZ]

I am no longer with the carrier- my phone is unlocked and it's an NC1 I downloaded the 5.0 update and renamed the .cfg to .zip it still didn't work in Stock recovery it shows error and something like build need 4.4.2 nb1 or 4.4.4 NJ4. Or something of sort. So I downloaded the 4.4 4 NJ4 and still says same pls help me