How do you install original 4.4.4 on AT&T Samsung S4 after unrooting?

Right now I am in the process of unrooting and restoring the original file for the AT&T version of Samsung S4 4.4.4. I looked and all I could find were original MD5 files up to 4.4.2 for AT&T, but none for 4.4.4, and the only 4.4.4 I found were rooted which I am not looking for. I know how to install the file but just can't find the original 4.4.4 for this version of S4 and would like to so I can install 5.0.1 update and then reroot. If it helps my model is SGH-1337. So what file do I need to install on my AT&T S4 to return it to its original system, not a rooted version where I can't install updates from.

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